Merge pull request rails#42614 from alkesh26/typo-fix-in-activerecord-legacy-connection

Typo fix in error raised

Author: guilleiguaran

activerecord/lib/active_record/core.rb

@@ -118,7 +118,7 @@ def self.connection_handlers=(handlers)
             Read more about how to migrate at: https://guides.rubyonrails.org/active_record_multiple_databases.html#migrate-to-the-new-connection-handling
           MSG
         else
-          raise NotImplementedError, "The new connection handling does not setting support multiple connection handlers."
+          raise NotImplementedError, "The new connection handling does not support multiple connection handlers."
         end
 
         @@connection_handlers = handlers