Update CHANGELOG with 3.10.2 entries (#1187)

* Update CHANGELOG with 3.10.2 entries

* Update post-patch-release instructions for CHANGELOG entries

Author: eramongodb

CHANGELOG.md

@@ -20,10 +20,20 @@ Changes prior to 3.9.0 are documented as [release notes on GitHub](https://githu
 - A future minor release plans to raise the minimum supported MongoDB Server version from 3.6 to 4.0. This is in
 accordance with [MongoDB Software Lifecycle Schedules](https://www.mongodb.com/legal/support-policy/lifecycles).
 
-## 3.10.2 [Unreleased]
+## 3.10.3 [Unreleased]
 
 <!-- Will contain entries for the next patch release -->
 
+## 3.10.2
+
+### Added
+
+- SSDLC Compliance Report and related release artifacts.
+
+### Fixed
+
+- Undefined behavior when moving a `mongocxx::v_noabi::events::topology_description::server_descriptions` object due to uninitialized data member access.
+
 ## 3.10.1
 
 ### Fixed

etc/releasing.md

@@ -671,6 +671,30 @@ Add a section for the next patch release, e.g. following a `1.2.3` release:
 
 Commit the changes to the `releases/vX.Y` branch and push the branch to the remote repository (a PR is not required for this step).
 
+Checkout the `post-release-changes` branch.
+
+Sync the entries in the patch release section to be consistent with the entries on the release branch, e.g. following a `1.2.3` release:
+
+```md
+## 1.3.0 [Unreleased]
+
+<!-- Will contain entries for the next minor release. -->
+<!-- Ensure any existing entries are not removed during the sync. -->
+
+## 1.2.4 [Unreleased]
+
+<!-- Will contain entries for the next patch release. -->
+
+## 1.2.3 <!-- Just released. -->
+
+<!-- Ensure these entries match those in the release. -->
+
+## 1.2.2 <!-- Prior release. -->
+```
+
+> [!TIP]
+> Use `git restore --source=rX.Y.Z --worktree CHANGELOG.md` to obtain the `CHANGELOG.md` in `rX.Y.Z` as unstaged changes.
+
 #### ... for a Non-Patch Release
 
 Checkout the `post-release-changes` branch.