Bump nokogiri from 1.16.6 to 1.18.3 in /docs

Bumps [nokogiri](https://github.com/sparklemotion/nokogiri) from 1.16.6 to 1.18.3.
- [Release notes](https://github.com/sparklemotion/nokogiri/releases)
- [Changelog](https://github.com/sparklemotion/nokogiri/blob/v1.18.3/CHANGELOG.md)
- [Commits](https://github.com/sparklemotion/nokogiri/compare/v1.16.6...v1.18.3)

---
updated-dependencies:
- dependency-name: nokogiri
  dependency-type: indirect
...

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

docs/Gemfile.lock

@@ -216,7 +216,7 @@ GEM
     minitest (5.24.1)
     net-http (0.4.1)
       uri
-    nokogiri (1.16.6-x86_64-linux)
+    nokogiri (1.18.3-x86_64-linux-gnu)
       racc (~> 1.4)
     octokit (4.25.1)
       faraday (>= 1, < 3)
@@ -224,7 +224,7 @@ GEM
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
     public_suffix (4.0.7)
-    racc (1.8.0)
+    racc (1.8.1)
     rb-fsevent (0.11.2)
     rb-inotify (0.11.1)
       ffi (~> 1.0)