Fixed typo in comment

activerecord/lib/active_record/explain.rb

@@ -27,7 +27,7 @@ def exec_explain(queries) # :nodoc:
         end.join("\n")
       end.join("\n")
 
-      # Overriding inspect to be more human readable, specially in the console.
+      # Overriding inspect to be more human readable, especially in the console.
       def str.inspect
         self
       end