Potential fix for pull request finding

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

Author: st0012

lib/rdoc/rbs_helper.rb

@@ -36,7 +36,7 @@ def valid_type?(sig)
 
       ##
       # Loads RBS signatures from the given directories.
-      # Returns a Hash mapping "ClassName#method_name" => "type sig string".
+      # Returns a Hash mapping "ClassName#method_name" => ["type sig string", ...].
 
       def load_signatures(*dirs)
         loader = RBS::EnvironmentLoader.new