Update changelog

Add a line item for using a better error message.

Also, add a link for an entry that didn't have one before.

CHANGELOG.md

@@ -2,7 +2,7 @@
 
 ## [UNRELEASED]
 
-No user facing changes.
+- Display a better error message when encountering a workflow that runs the `codeql-action/init` action multiple times. [#876](https://github.com/github/codeql-action/pull/876)
 
 ## 1.0.28 - 18 Jan 2022
 
@@ -11,7 +11,7 @@ No user facing changes.
 
 ## 1.0.27 - 11 Jan 2022
 
-- The `analyze` and `upload-sarif` actions will now wait up to 2 minutes for processing to complete after they have uploaded the results so they can report any processing errors that occurred. This behavior can be disabled by setting the `wait-for-processing` action input to `"false"`.
+- The `analyze` and `upload-sarif` actions will now wait up to 2 minutes for processing to complete after they have uploaded the results so they can report any processing errors that occurred. This behavior can be disabled by setting the `wait-for-processing` action input to `"false"`. [#855](https://github.com/github/codeql-action/pull/855)
 
 ## 1.0.26 - 10 Dec 2021