Correct comment for (beginning|end)_of_minute

activesupport/lib/active_support/core_ext/date_time/calculations.rb

@@ -123,8 +123,8 @@ def end_of_hour
     change(:min => 59, :sec => 59)
   end
   alias :at_end_of_hour :end_of_hour
-  
-  # Returns a new DateTime representing the start of the hour (hh:mm:00).
+
+  # Returns a new DateTime representing the start of the minute (hh:mm:00).
   def beginning_of_minute
     change(:sec => 0)
   end

activesupport/lib/active_support/core_ext/time/calculations.rb

@@ -188,13 +188,13 @@ def end_of_hour
   end
   alias :at_end_of_hour :end_of_hour
 
-  # Returns a new Time representing the start of the hour (x:xx:00)
+  # Returns a new Time representing the start of the minute (x:xx:00)
   def beginning_of_minute
     change(:sec => 0)
   end
   alias :at_beginning_of_minute :beginning_of_minute
 
-  # Returns a new Time representing the end of the hour, x:59:59.999999 (.999999999 in ruby1.9)
+  # Returns a new Time representing the end of the minute, x:xx:59.999999 (.999999999 in ruby1.9)
   def end_of_minute
     change(
       :sec => 59,