chore: update 2.9.4 CHANGELOG to match GitHub release note (#9975)

We made a small change to the release note for 2.9.4. Matching the
CHANGELOG to reflect this.

## Checklist
- [x] PR author has checked that all the criteria below are met
- The PR description includes an overview of the change
- The PR description articulates the motivation for the change
- The change includes tests OR the PR description describes a testing
strategy
- The PR description notes risks associated with the change, if any
- Newly-added code is easy to change
- The change follows the [library release note
guidelines](https://ddtrace.readthedocs.io/en/stable/releasenotes.html)
- The change includes or references documentation updates if necessary
- Backport labels are set (if
[applicable](https://ddtrace.readthedocs.io/en/latest/contributing.html#backporting))

## Reviewer Checklist
- [ ] Reviewer has checked that all the criteria below are met 
- Title is accurate
- All changes are related to the pull request's stated goal
- Avoids breaking
[API](https://ddtrace.readthedocs.io/en/stable/versioning.html#interfaces)
changes
- Testing strategy adequately addresses listed risks
- Newly-added code is easy to change
- Release note makes sense to a user of the library
- If necessary, author has acknowledged and discussed the performance
implications of this PR as reported in the benchmarks PR comment
- Backport labels are set in a manner that is consistent with the
[release branch maintenance
policy](https://ddtrace.readthedocs.io/en/latest/contributing.html#backporting)

CHANGELOG.md

@@ -7,10 +7,6 @@ Changelogs for versions not listed here can be found at https://github.com/DataD
 ## 2.9.4
 
 
-### New Features
-
-- langchain: Introduces support for `langchain==0.2.0` by conditionally patching the `langchain-community` module if available, which is an optional dependency for `langchain>=0.2.0`. See the langchain integration docs for more details.
-
 ### Bug Fixes
 
 - langchain: This fix resolves an issue where the wrong langchain class name was being used to check for Pinecone vectorstore instances.
@@ -19,6 +15,7 @@ Changelogs for versions not listed here can be found at https://github.com/DataD
 - redis: Resolves an issue in the `redis` exception handling where an `UnboundLocalError` was raised instead of the expected `BaseException`.
 - Code Security: Logs warning instead of throwing an exception in the native module if IAST is not enabled by env var.
 - langchain: Fixes an issue of `langchain` patching errors due to the `langchain-community` module becoming an optional dependency in `langchain>=0.2.0`. The `langchain` integration now conditionally patches `langchain-community` methods if it is available. See the langchain integration docs for more details.
+- langchain: Resolves incompatibilities with langchain==0.2.0
 - ASM: Resolves an issue where ASM one click feature could fail to deactivate ASM.