Fixed typo

Fixed the same typo in two other cases as already done in #964

Author: 4TT1L4

doc_source/cfn-whatis-howdoesitwork.md

@@ -39,7 +39,7 @@ The calls that CloudFormation makes are all declared by your template\. For exam
 
 1. Save the template locally or in an S3 bucket\. If you created a template, save it with a file extension like: `.json`, `.yaml`, or `.txt`\.
 
-1. Create an CloudFormation stack by specifying the location of your template file, such as a path on your local computer or an Amazon S3 URL\. If the template contains parameters, you can specify input values when you create the stack\. Parameters enable you to pass in values to your template so that you can customize your resources each time you create a stack\.
+1. Create a CloudFormation stack by specifying the location of your template file, such as a path on your local computer or an Amazon S3 URL\. If the template contains parameters, you can specify input values when you create the stack\. Parameters enable you to pass in values to your template so that you can customize your resources each time you create a stack\.
 
    You can create stacks by using the CloudFormation [console](cfn-console-create-stack.md), [API](https://docs.aws.amazon.com/AWSCloudFormation/latest/APIReference/API_CreateStack.html), or [AWS CLI](https://docs.aws.amazon.com/cli/latest/reference/cloudformation/create-stack.html)\.
 **Note**  
@@ -59,7 +59,7 @@ When you need to update your stack's resources, you can modify the stack's templ
 **Important**  
 Updates can cause interruptions\. Depending on the resource and properties that you are updating, an update might interrupt or even replace an existing resource\. For more information, see [AWS CloudFormation stack updates](using-cfn-updating-stacks.md)\.
 
-1. You can modify an CloudFormation stack template by using [AWS CloudFormation Designer](https://console.aws.amazon.com/cloudformation/designer) or a text editor\. For example, if you want to change the instance type for an EC2 instance, you would change the value of the `InstanceType` property in the original stack's template\.
+1. You can modify a CloudFormation stack template by using [AWS CloudFormation Designer](https://console.aws.amazon.com/cloudformation/designer) or a text editor\. For example, if you want to change the instance type for an EC2 instance, you would change the value of the `InstanceType` property in the original stack's template\.
 
    For more information, see [Modifying a stack template](using-cfn-updating-stacks-get-template.md)\.
 
@@ -87,4 +87,4 @@ After all the resources have been deleted, CloudFormation signals that your stac
 
 ## Additional resources<a name="w8676ab1b5c17c21"></a>
 + For more information about creating CloudFormation templates, see [Template anatomy](template-anatomy.md)\.
-+ For more information about creating, updating, or deleting stacks, see [Working with stacks](stacks.md)\.
++ For more information about creating, updating, or deleting stacks, see [Working with stacks](stacks.md)\.