[htaccess] Add a shortcut for missing example URLs

.htaccess

@@ -9,5 +9,6 @@ RewriteRule ^update$ https://github.com/rg3/youtube-dl/blob/master/README.md#how
 RewriteRule ^donat(e|ions)$ https://rg3.github.io/youtube-dl/donations.html [R=302,L]
 RewriteRule ^(faq-)?anime$ https://github.com/rg3/youtube-dl/blob/master/README.md#can-you-add-support-for-this-anime-video-site-or-site-which-shows-current-movies-for-free [R=302,L,NE]
 RewriteRule ^(faq-)?citw$ https://github.com/rg3/youtube-dl/blob/master/README.md#do-i-always-have-to-pass-in---max-quality-format-or--citw [R=302,L,NE]
+RewriteRule ^example-url$ https://github.com/rg3/youtube-dl/blob/master/CONTRIBUTING.md#is-the-description-of-the-issue-itself-sufficient [R=302,L,NE]