[about] Moving docs link to tootsuite/documentation (#1573)

related: https://github.com/tootsuite/mastodon/commit/1236529e39a7e2534fdd34686a749b5a386c109b



Signed-off-by: lindwurm <lindwurm.q@gmail.com>

app/views/about/show.html.haml

@@ -35,7 +35,7 @@
         .info
           = link_to t('auth.login'), new_user_session_path, class: 'webapp-btn'
           ·
-          = link_to t('about.other_instances'), 'https://github.com/tootsuite/mastodon/blob/master/docs/Using-Mastodon/List-of-Mastodon-instances.md'
+          = link_to t('about.other_instances'), 'https://github.com/tootsuite/documentation/blob/master/Using-Mastodon/List-of-Mastodon-instances.md'
           ·
           = link_to t('about.about_this'), about_more_path
 
@@ -79,8 +79,8 @@
     .info
       = link_to t('about.terms'), terms_path
       ·
-      = link_to t('about.apps'), 'https://github.com/tootsuite/mastodon/blob/master/docs/Using-Mastodon/Apps.md'
+      = link_to t('about.apps'), 'https://github.com/tootsuite/documentation/blob/master/Using-Mastodon/Apps.md'
       ·
       = link_to t('about.source_code'), 'https://github.com/tootsuite/mastodon'
       ·
-      = link_to t('about.other_instances'), 'https://github.com/tootsuite/mastodon/blob/master/docs/Using-Mastodon/List-of-Mastodon-instances.md'
+      = link_to t('about.other_instances'), 'https://github.com/tootsuite/documentation/blob/master/Using-Mastodon/List-of-Mastodon-instances.md'