scm: git: fix typo of comments about fetching revisions (#9472)

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@7660 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/models/repository/git.rb

@@ -103,7 +103,7 @@ class Repository::Git < Repository
   # However, Git does not have a sequential commit numbering.
   #
   # In order to fetch only new adding revisions,
-  # Redmine need to parse revisions per branch.
+  # Redmine needs to parse revisions per branch.
   # Branch "last_scmid" is for this requirement.
   #
   # In Git and Mercurial, revisions are not in date order.