Refs #21114: DROP: Use opened Fast DDS branch

Signed-off-by: eduponz <eduardoponz@eprosima.com>

Author: EduPonz

docs/conf.py

@@ -221,7 +221,7 @@ def configure_doxyfile(
             fastdds.refs.__contains__('origin/{}'.format(fastdds_branch))):
         fastdds_branch = 'origin/{}'.format(fastdds_branch)
     else:
-        fastdds_branch = 'origin/2.14.x'
+        fastdds_branch = 'origin/hotfix/2.14.x/doxygen'
         print(f'Fast DDS branch is not set by env var. Using "{fastdds_branch}"')
 
     # Actual checkout