Fix a sentence that was missing a word

Signed-off-by: Edwin Kempin <ekempin@google.com>
Change-Id: I3c4568fcfccbd16f72205e4847c4526ee77bd20d
diff --git a/index.md b/index.md
index 685a60c..8566058 100644
--- a/index.md
+++ b/index.md
@@ -140,8 +140,8 @@
 check the questions tagged with <a href="https://stackoverflow.com/questions/tagged/gerrit">[gerrit]</a>
 on Stack Overflow.
 
-The repo-discuss mailing is managed to prevent spam posts. This means
-posts from new participants must be approved manually before they
+The repo-discuss mailing list is managed to prevent spam posts. This
+means posts from new participants must be approved manually before they
 appear on the mailing list. Approvals normally happen within 1 work
 day. Posts of people that participate in mailing list discussions
 frequently are approved automatically.