docs: Fixed "APK signature scheme v2" link in N API Overview.

The link in the TOC of the "Android N for Developers" page now
navigates readers to "APK signature scheme v2" properly.

Bug: 28041151
Change-Id: Idb143fd740395802c506b7c092976b49c6739ecc
diff --git a/docs/html/preview/api-overview.jd b/docs/html/preview/api-overview.jd
index c2421eb..29f52e0 100644
--- a/docs/html/preview/api-overview.jd
+++ b/docs/html/preview/api-overview.jd
@@ -32,7 +32,7 @@
         <li><a href="#key_attestation">Key Attestation</a></li>
         <li><a href="#network_security_config">Network Security Config</a></li>
         <li><a href="#default_trusted_ca">Default Trusted CA</a></li>
-        <li><a href="apk_signature_v2">APK signature scheme v2</a></li>
+        <li><a href="#apk_signature_v2">APK signature scheme v2</a></li>
         <li><a href="#scoped_directory_access">Scoped directory access</a></li>
         <li><a href="#launcher_shortcuts">Launcher shortcuts</a></li>
       </ol>