Add changelog entries from botocore

Author: aws-sdk-python-automation

.changes/next-release/api-change-appsync-1237.json

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+{
+  "type": "api-change",
+  "category": "``appsync``",
+  "description": "[``botocore``] AWS AppSync now supports custom domain names, allowing you to associate a domain name that you own with an AppSync API in your account."
+}

.changes/next-release/api-change-location-30261.json

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+{
+  "type": "api-change",
+  "category": "``location``",
+  "description": "[``botocore``] This release adds support for Accuracy position filtering, position metadata and autocomplete for addresses and points of interest based on partial or misspelled free-form text."
+}

.changes/next-release/api-change-route53-46090.json

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+{
+  "type": "api-change",
+  "category": "``route53``",
+  "description": "[``botocore``] Add PriorRequestNotComplete exception to UpdateHostedZoneComment API"
+}