Docs: Fixing many, small issues in the Source section.

Bug: 10488940
Change-Id: I17198a8858ef8af59deaf5d545b7f80d4597b973
diff --git a/src/source/using-repo.jd b/src/source/using-repo.jd
index 67ca7b7..ce86c43 100644
--- a/src/source/using-repo.jd
+++ b/src/source/using-repo.jd
@@ -147,7 +147,7 @@
 <p><code>REPO_PATH</code> is the path relative to the root of the client.</p>
 </li>
 <li>
-<p><code>REPO_REMOTE</code> is the name of the remote sstem from the manifest.</p>
+<p><code>REPO_REMOTE</code> is the name of the remote system from the manifest.</p>
 </li>
 <li>
 <p><code>REPO_LREV</code> is the name of the revision from the manifest, translated to a local tracking branch.  Used if you need to pass the manifest revision to a locally executed git command.</p>