docs: studio 1.3 manifest merger update

<p class="note"><strong>Note:</strong> Android Studio provides a default

<code>&#36;{applicationId}</code> placeholder for the <code>build.gradle</code>

<code>applicationId</code> value that is not shown in the build file.</p>

<code>applicationId</code> value that is not shown in the build file.

When building an AAR (Android ARchive) package for library modules, do not provide an

automatic <code>&#64;{applicationId}</code> placeholder in the

<a href="{@docRoot}tools/building/manifest-merge.html">manifest merge</a> settings.

Instead, use a different placeholder, such as <code>&#64;{libApplicationId}</code> and

provide a value for it if you want to include application Ids in the archive library. </p>

<p>Manifest entry:</p>