Run bundle install to update docs

Author: dependabot[bot]

docs/Gemfile.lock

@@ -268,7 +268,7 @@ GEM
     rb-fsevent (0.11.2)
     rb-inotify (0.11.1)
       ffi (~> 1.0)
-    rexml (3.4.1)
+    rexml (3.4.2)
     rouge (3.30.0)
     rubyzip (2.4.1)
     safe_yaml (1.0.5)