Minor comment fix. [ci skip]

activesupport/lib/active_support/core_ext/integer/inquiry.rb

@@ -8,11 +8,11 @@ def positive?
     self > 0
   end
 
-  # Returns true if the number is positive.
+  # Returns true if the number is negative.
   #
-  #   -1.positive? # => true
-  #   0.positive?  # => false
-  #   1.positive?  # => false
+  #   -1.negative? # => true
+  #   0.negative?  # => false
+  #   1.negative?  # => false
   def negative?
     self < 0
   end