Update UI: use DOCSP-253 branch of docs-tools

Author: kay-kim

config/build_conf.yaml

@@ -23,7 +23,7 @@ system:
     - 'manpages.yaml'
     - includes: '/source/includes/metadata.yaml'
 assets:
-  - branch: master
+  - branch: DOCSP-253
     path: build/docs-tools
     repository: https://github.com/mongodb/docs-tools.git
 paths: