[@azure/cosmos] Update CHANGELOG.md (#31835)

### Packages impacted by this PR
@azure/cosmos

### Issues associated with this PR


### Describe the problem that is addressed by this PR
Update changeLog for release.

### What are the possible designs available to address the problem? If
there are more than one possible design, why was the one in this PR
chosen?


### Are there test cases added in this PR? _(If not, why?)_
N/A

### Provide a list of related PRs _(if any)_


### Command used to generate this PR:**_(Applicable only to SDK release
request PRs)_

### Checklists
- [ ] Added impacted package name to the issue description
- [ ] Does this PR needs any fixes in the SDK Generator?** _(If so,
create an Issue in the
[Autorest/typescript](https://github.com/Azure/autorest.typescript)
repository and link it here)_
- [ ] Added a changelog (if necessary)

sdk/cosmosdb/cosmos/CHANGELOG.md

@@ -1,10 +1,11 @@
 # Release History
 
-## 4.2.0 (2024-11-18)
+## 4.2.0 (2024-11-19)
 
 ### Features Added
 
-- Full Text and Hybrid Search Support: Implemented full text and indexing policies, and added support for full text and hybrid search queries.
+- Full Text Support: This feature adds support for full text search policy and indexing policy. It also enables performing full text search queries. [docs](https://learn.microsoft.com/azure/cosmos-db/gen-ai/full-text-search)
+- Hybrid Search Support: This feature adds support for performing hybrid search queries. [docs](https://learn.microsoft.com/azure/cosmos-db/gen-ai/hybrid-search)
 
 ## 4.1.1 (2024-08-30)