Fix "elses" to "else's"

Author: mikelehen

remotes/index.html

@@ -94,7 +94,7 @@ <h4>
     </h4>
 
     <p>If you want to share a locally created repository, or you want to take
-    contributions from someone elses repository - if you want to interact in
+    contributions from someone else's repository - if you want to interact in
     any way with a new repository, it's generally easiest to add it as a remote.
     You do that by running <code>git remote add [alias] [url]</code>.  That
     adds <code>[url]</code> under a local remote named <code>[alias]</code>.</p>