docs: remove duplicated '\'

Author: kenjis

user_guide_src/source/libraries/time.rst

@@ -457,7 +457,7 @@ Works exactly the same as ``isBefore()`` except checks if the time is after the
 Viewing Differences
 ===================
 
-To compare two Times directly, you would use the ``difference()`` method, which returns a ``CodeIgniter\\I18n\\TimeDifference``
+To compare two Times directly, you would use the ``difference()`` method, which returns a ``CodeIgniter\I18n\TimeDifference``
 instance. The first parameter is either a Time instance, a DateTime instance, or a string with the date/time. If
 a string is passed in the first parameter, the second parameter can be a timezone string::