Bug 1654173 - Remove redundant stand-alone comment for keyboard shortcuts r=fluent-reviewers,Pike

Differential Revision: https://phabricator.services.mozilla.com/D84292

browser/locales/en-US/browser/browserSets.ftl

@@ -150,10 +150,6 @@ bookmark-show-sidebar-shortcut =
 ## If shift key is needed with your locale popular keyboard for them,
 ## you can use these alternative items. Otherwise, their values should be empty.
 
-# If in keyboard layouts popular for your locale you need to use the shift key
-# to access the original shortcuts, the following shortcuts can be used.
-# Otherwise their values should remain empty.
-
 full-zoom-reduce-shortcut =
     .key = -