Correct method notation for #acts_like? [ci skip]

activesupport/lib/active_support/core_ext/object/acts_like.rb

 class Object
   # A duck-type assistant method. For example, Active Support extends Date
-  # to define an acts_like_date? method, and extends Time to define
-  # acts_like_time?. As a result, we can do "x.acts_like?(:time)" and
-  # "x.acts_like?(:date)" to do duck-type-safe comparisons, since classes that
-  # we want to act like Time simply need to define an acts_like_time? method.
+  # to define an <tt>acts_like_date?</tt> method, and extends Time to define
+  # <tt>acts_like_time?</tt>. As a result, we can do <tt>x.acts_like?(:time)</tt> and
+  # <tt>x.acts_like?(:date)</tt> to do duck-type-safe comparisons, since classes that
+  # we want to act like Time simply need to define an <tt>acts_like_time?</tt> method.
   def acts_like?(duck)
     respond_to? :"acts_like_#{duck}?"
   end