rb - fix syntax issue

Author: titusfortner

rb/lib/selenium/webdriver/common/w3c_error.rb

@@ -70,7 +70,7 @@ class InvalidSelectorError < WebDriverError; end
 
       #
       # Occurs if the given session id is not in the list of active sessions,
-      # meaning the session either does not exist or that it''s not active.
+      # meaning the session either does not exist or that it's not active.
       #
 
       class InvalidSessionIdError < WebDriverError; end
@@ -82,7 +82,7 @@ class InvalidSessionIdError < WebDriverError; end
       class JavascriptError < WebDriverError; end
 
       #
-      # The target for mouse interaction is not in the browser''s viewport and
+      # The target for mouse interaction is not in the browser's viewport and
       # cannot be brought into that viewport.
       #
 
@@ -141,7 +141,7 @@ class StaleElementReferenceError < WebDriverError; end
       class TimeoutError < WebDriverError; end
 
       #
-      # A request to set a cookie''s value could not be satisfied.
+      # A request to set a cookie's value could not be satisfied.
       #
 
       class UnableToSetCookieError < WebDriverError; end