Fix typo on Integer.try_convert [ci skip]

numeric.rb

@@ -237,7 +237,7 @@ end
 #  Otherwise if +object+ responds to <tt>:to_int</tt>,
 #  calls <tt>object.to_int</tt> and returns the result.
 #
-#  Returns +nil+ if +object+ does not respond to <tt>:to_ary</tt>
+#  Returns +nil+ if +object+ does not respond to <tt>:to_int</tt>
 #
 #  Raises an exception unless <tt>object.to_int</tt> returns an \Integer object.
 #