Update dialog help text of 'MoreDirectChannels' and 'AddUsersToTeam' modals (#6744)

webapp/i18n/en.json

@@ -1792,8 +1792,7 @@
   "msg_typing.someone": "Someone",
   "multiselect.add": "Add",
   "multiselect.go": "Go",
-  "multiselect.instructions": "Use up/down arrows to navigate and enter to select",
-  "multiselect.numPeopleRemaining": "You can add {num, number} more {num, plural, one {person} other {people}}. ",
+  "multiselect.numPeopleRemaining": "Use ↑↓ to browse, ↵ to select. You can add {num, number} more {num, plural, one {person} other {people}}. ",
   "multiselect.numRemaining": "You can add {num, number} more",
   "multiselect.placeholder": "Search and add members",
   "navbar.addMembers": "Add Members",