docs(cfnspec): update CloudFormation documentation (#18371)

Co-authored-by: AWS CDK Team <[email protected]>

Author: aws-cdk-automation

packages/@aws-cdk/cfnspec/spec-source/cfn-docs/cfn-docs.json

@@ -29636,7 +29636,7 @@
         "Id": "",
         "Ref": "When the logical ID of this resource is provided to the Ref intrinsic function, Ref returns the resource name, such as `mystack-abc1d2efg3h4.` For more information about using the Ref function, see [Ref](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/intrinsic-function-reference-ref.html) ."
       },
-      "description": "The AWS::OpenSearchService::Domain resource creates an Amazon OpenSearch Service (successor to Amazon Elasticsearch Service) domain.\n\n*Important* : For instructions to upgrade domains defined within CloudFormation from Elasticsearch to OpenSearch, see [Remarks](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-opensearchservice-domain.html#aws-resource-opensearchservice-domain--remarks) .",
+      "description": "The AWS::OpenSearchService::Domain resource creates an Amazon OpenSearch Service (successor to Amazon Elasticsearch Service) domain.\n\n> The `AWS::OpenSearchService::Domain` resource replaces the legacy [AWS::Elasticsearch::Domain](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-elasticsearch-domain.html) resource. While the Elasticsearch resource and options are still supported, we recommend modifying your existing Cloudformation templates to use the new OpenSearch Service resource, which supports both OpenSearch and legacy Elasticsearch engines. For instructions to upgrade domains defined within CloudFormation from Elasticsearch to OpenSearch, see [Remarks](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-elasticsearch-domain.html#aws-resource-elasticsearch-domain--remarks) .",
       "properties": {
         "AccessPolicies": "An AWS Identity and Access Management ( IAM ) policy document that specifies who can access the OpenSearch Service domain and their permissions. For more information, see [Configuring access policies](https://docs.aws.amazon.com/opensearch-service/latest/developerguide/ac.html#ac-creating) in the *Amazon OpenSearch Service Developer Guide* .",
         "AdvancedOptions": "Additional options to specify for the OpenSearch Service domain. For more information, see [Advanced cluster parameters](https://docs.aws.amazon.com/opensearch-service/latest/developerguide/createupdatedomains.html#createdomain-configure-advanced-options) in the *Amazon OpenSearch Service Developer Guide* .",
@@ -32319,8 +32319,8 @@
       "properties": {
         "ConnectionBorrowTimeout": "The number of seconds for a proxy to wait for a connection to become available in the connection pool. Only applies when the proxy has opened its maximum number of connections and all connections are busy with client sessions.\n\nDefault: 120\n\nConstraints: between 1 and 3600, or 0 representing unlimited",
         "InitQuery": "One or more SQL statements for the proxy to run when opening each new database connection. Typically used with `SET` statements to make sure that each connection has identical settings such as time zone and character set. For multiple statements, use semicolons as the separator. You can also include multiple variables in a single `SET` statement, such as `SET x=1, y=2` .\n\nDefault: no initialization query",
-        "MaxConnectionsPercent": "The maximum size of the connection pool for each target in a target group. For Aurora MySQL, it is expressed as a percentage of the `max_connections` setting for the RDS DB instance or Aurora DB cluster used by the target group.\n\nDefault: 100\n\nConstraints: between 1 and 100",
-        "MaxIdleConnectionsPercent": "Controls how actively the proxy closes idle database connections in the connection pool. A high value enables the proxy to leave a high percentage of idle connections open. A low value causes the proxy to close idle client connections and return the underlying database connections to the connection pool. For Aurora MySQL, it is expressed as a percentage of the `max_connections` setting for the RDS DB instance or Aurora DB cluster used by the target group.\n\nDefault: 50\n\nConstraints: between 0 and `MaxConnectionsPercent`",
+        "MaxConnectionsPercent": "The maximum size of the connection pool for each target in a target group. The value is expressed as a percentage of the `max_connections` setting for the RDS DB instance or Aurora DB cluster used by the target group.\n\nDefault: 100\n\nConstraints: between 1 and 100",
+        "MaxIdleConnectionsPercent": "Controls how actively the proxy closes idle database connections in the connection pool. The value is expressed as a percentage of the `max_connections` setting for the RDS DB instance or Aurora DB cluster used by the target group. With a high value, the proxy leaves a high percentage of idle database connections open. A low value causes the proxy to close more idle connections and return them to the database.\n\nDefault: 50\n\nConstraints: between 0 and `MaxConnectionsPercent`",
         "SessionPinningFilters": "Each item in the list represents a class of SQL operations that normally cause all later statements in a session using a proxy to be pinned to the same underlying database connection. Including an item in the list exempts that class of SQL operations from the pinning behavior.\n\nDefault: no session pinning filters"
       }
     },
@@ -35039,7 +35039,7 @@
         "Tags": "Optional metadata that you assign to a resource in the form of an arbitrary set of tags (key-value pairs). Tags enable you to categorize a resource in different ways, such as by purpose, owner, or environment. For example, you might want to tag a Systems Manager parameter to identify the type of resource to which it applies, the environment, or the type of configuration data referenced by the parameter.",
         "Tier": "The parameter tier.",
         "Type": "The type of parameter.\n\n> AWS CloudFormation doesn't support creating a `SecureString` parameter type. \n\n*Allowed Values* : String | StringList",
-        "Value": "The parameter value."
+        "Value": "The parameter value.\n\n> If type is `StringList` , the system returns a comma-separated string with no spaces between commas in the `Value` field."
       }
     },
     "AWS::SSM::PatchBaseline": {