Bump tzinfo from 1.2.7 to 1.2.10 in /docs

Bumps [tzinfo](https://github.com/tzinfo/tzinfo) from 1.2.7 to 1.2.10.
- [Release notes](https://github.com/tzinfo/tzinfo/releases)
- [Changelog](https://github.com/tzinfo/tzinfo/blob/master/CHANGES.md)
- [Commits](https://github.com/tzinfo/tzinfo/compare/v1.2.7...v1.2.10)

---
updated-dependencies:
- dependency-name: tzinfo
  dependency-type: direct:production
...

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

docs/Gemfile.lock

@@ -233,7 +233,7 @@ GEM
     thread_safe (0.3.6)
     typhoeus (1.3.1)
       ethon (>= 0.9.0)
-    tzinfo (1.2.7)
+    tzinfo (1.2.10)
       thread_safe (~> 0.1)
     tzinfo-data (1.2019.3)
       tzinfo (>= 1.0.0)