Bump the bundler group across 1 directory with 2 updates

Bumps the bundler group with 2 updates in the /docs directory: [commonmarker](https://github.com/gjtorikian/commonmarker) and [rexml](https://github.com/ruby/rexml).


Updates `commonmarker` from 0.23.7 to 0.23.10
- [Release notes](https://github.com/gjtorikian/commonmarker/releases)
- [Changelog](https://github.com/gjtorikian/commonmarker/blob/v0.23.10/CHANGELOG.md)
- [Commits](gjtorikian/commonmarker@v0.23.7...v0.23.10)

Updates `rexml` from 3.2.5 to 3.3.9
- [Release notes](https://github.com/ruby/rexml/releases)
- [Changelog](https://github.com/ruby/rexml/blob/master/NEWS.md)
- [Commits](ruby/rexml@v3.2.5...v3.3.9)

---
updated-dependencies:
- dependency-name: commonmarker
  dependency-version: 0.23.10
  dependency-type: indirect
  dependency-group: bundler
- dependency-name: rexml
  dependency-version: 3.3.9
  dependency-type: indirect
  dependency-group: bundler
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

docs/Gemfile.lock

@@ -4,7 +4,7 @@ GEM
     addressable (2.8.0)
       public_suffix (>= 2.0.2, < 5.0)
     colorator (1.1.0)
-    commonmarker (0.23.7)
+    commonmarker (0.23.10)
     concurrent-ruby (1.1.10)
     em-websocket (0.5.3)
       eventmachine (>= 0.12.9)
@@ -84,7 +84,7 @@ GEM
     rb-fsevent (0.11.1)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    rexml (3.2.5)
+    rexml (3.3.9)
     rouge (3.28.0)
     ruby2_keywords (0.0.5)
     safe_yaml (1.0.5)