Merge pull request #21222 from hashicorp/d-changelog-link

Fix broken CHANGELOG link, remove branch dictionary

CHANGELOG.md

@@ -2425,4 +2425,4 @@ BUG FIXES
 
 For information on prior major releases, see their changelogs:
 
-* [2.x and earlier](https://github.com/hashicorp/terraform-provider-aws/blob/release/2.x/CHANGELOG.md)
+* [2.70.0 and earlier](https://github.com/hashicorp/terraform-provider-aws/blob/v2.70.0/CHANGELOG.md)

docs/MAINTAINING.md

@@ -14,7 +14,6 @@
             - [yaml.v2 Updates](#yaml-v2-updates)
     - [Pull Request Merge Process](#pull-request-merge-process)
 - [Breaking Changes](#breaking-changes)
-- [Branch Dictionary](#branch-dictionary)
 - [Environment Variable Dictionary](#environment-variable-dictionary)
 - [Release Process](#release-process)
 
@@ -318,17 +317,6 @@ When breaking changes to the provider are necessary we release them in a major v
 - Add the issue/PR to the next major version milestone.
 - Leave a comment why this is a breaking change or otherwise only being considered for a major version update. If possible, detail any changes that might be made for the contributor to accomplish the task without a breaking change.
 
-## Branch Dictionary
-
-The following branch conventions are used:
-
-| Branch | Example | Description |
-|--------|---------|-------------|
-| `main` | `main` | Main, unreleased code branch. |
-| `release/*` | `release/2.x` | Backport branches for previous major releases. |
-
-Additional branch naming recommendations can be found in the [Pull Request Submission and Lifecycle documentation](contributing/pullrequest-submission-and-lifecycle.md#branch-prefixes).
-
 ## Environment Variable Dictionary
 
 Environment variables (beyond standard AWS Go SDK ones) used by acceptance testing. See also the `aws/internal/envvar` package.