ENGCOM-5023: Fixed typo issue #22594

Author: sivaschenko

lib/web/css/docs/source/_responsive.less

@@ -81,7 +81,7 @@
 //
 //  ## Gathering
 //
-//  Everything that you include in collector mixins above will go in place where they declarated.
+//  Everything that you include in collector mixins above will go in place where they declared.
 //  As example all
 //  ```css
 //  .media-width(@extremum, @break) {