build(deps): bump ruby2_keywords from 0.0.4 to 0.0.5 in /docs

Bumps [ruby2_keywords](https://github.com/ruby/ruby2_keywords) from 0.0.4 to 0.0.5.
- [Release notes](https://github.com/ruby/ruby2_keywords/releases)
- [Commits](https://github.com/ruby/ruby2_keywords/compare/v0.0.4...v0.0.5)

---
updated-dependencies:
- dependency-name: ruby2_keywords
  dependency-type: indirect
  update-type: version-update:semver-patch
...

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

docs/Gemfile.lock

@@ -254,7 +254,7 @@ GEM
     rouge (3.26.0)
     ruby-enum (0.9.0)
       i18n
-    ruby2_keywords (0.0.4)
+    ruby2_keywords (0.0.5)
     rubyzip (2.3.2)
     safe_yaml (1.0.5)
     sass (3.7.4)