docs: fix wacky markup bug caused by lack of sentence terminator

Change-Id: Ibb8b57c176f026bb1ea573a545036d2bc91955e4

Author: scottamain

core/res/res/values/attrs_manifest.xml

@@ -1566,7 +1566,7 @@
     <!-- The attribute that holds a Base64-encoded public key. -->
     <attr name="publicKey" format="string" />
 
-    <!-- Attributes relating to a package verifier -->
+    <!-- Attributes relating to a package verifier. -->
     <declare-styleable name="AndroidManifestPackageVerifier" parent="AndroidManifest">
         <!-- Specifies the Java-style package name that defines this
              package verifier. -->