message: docs: remove VS 2015 guide
  This guide is outdated and doesn't appear in the navigation.
  Fixes
  PR Close
diff: @@ -1124,7 +1124,6 @@ groups:
  'aio/content/guide/reviewing-content.md',
  'aio/content/guide/updating-content-github-ui.md',
  'aio/content/guide/updating-search-keywords.md',
  - 'aio/content/guide/visual-studio-2015.md'
  ])
  reviewers:
  users:
  