Merge pull request #2243 from ruby/dependabot/bundler/rdoc-6.11.0

Bump rdoc from 6.10.0 to 6.11.0

Author: soutaro

Gemfile.lock

@@ -87,7 +87,7 @@ GEM
     rb-fsevent (0.11.2)
     rb-inotify (0.11.1)
       ffi (~> 1.0)
-    rdoc (6.10.0)
+    rdoc (6.11.0)
       psych (>= 4.0.0)
     regexp_parser (2.10.0)
     rspec (3.13.0)