DOCSP-48213 - Index definitions 404 (#106) (#108)

Co-authored-by: Rea Rustagi <85902999+rustagir@users.noreply.github.com>
(cherry picked from commit 58970c4)

Co-authored-by: Mike Woofter <108414937+mongoKart@users.noreply.github.com>

Author: github-actions[bot]

source/whats-new.txt

@@ -143,7 +143,7 @@ The v3.9 driver release includes the following new features:
   ``TRUE``, the ``CMAKE_INSTALL_PREFIX`` option defaults to the build directory.
   The default value of this option is ``TRUE``.
 - Adds an API for managing
-  :atlas:`Atlas Search indexes <atlas-search/index-definitions/#std-label-ref-index-definitions>`.
+  :atlas:`Atlas Search indexes </atlas-search/manage-indexes/>`.
 - Adds the ``VERSIONINFO`` resource to ``bsoncxx.dll`` and ``mongocxx.dll``.
 - Explicitly documents that throwing an exception from an APM callback is undefined behavior.
 - Does not prematurely install MNMLSTC Core headers during the CMake build step.