Change emoji language from award to add

doc/api/api_resources.md

doc/api/award_emoji.md

doc/api/emoji_reactions.md

doc/api/graphql/custom_emoji.md

doc/api/projects.md

doc/operations/incident_management/status_page.md

doc/user/award_emojis.md

doc/user/emoji_reactions.md

doc/user/group/epics/index.md

doc/user/markdown.md

doc/user/project/integrations/webhook_events.md

doc/user/project/issues/sorting_issue_lists.md