Bump rexml in /docs in the bundler group across 1 directory

Bumps the bundler group with 1 update in the /docs directory: [rexml](https://github.com/ruby/rexml).


Updates `rexml` from 3.3.9 to 3.4.2
- [Release notes](https://github.com/ruby/rexml/releases)
- [Changelog](https://github.com/ruby/rexml/blob/master/NEWS.md)
- [Commits](https://github.com/ruby/rexml/compare/v3.3.9...v3.4.2)

---
updated-dependencies:
- dependency-name: rexml
  dependency-version: 3.4.2
  dependency-type: indirect
  dependency-group: bundler
...

Signed-off-by: dependabot[bot] <support@github.com>

docs/Gemfile.lock

@@ -224,7 +224,7 @@ GEM
     rb-fsevent (0.11.2)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    rexml (3.3.9)
+    rexml (3.4.2)
     rouge (3.26.0)
     ruby2_keywords (0.0.5)
     rubyzip (2.3.2)