Merge "docs: fixed "percent" path" into mnc-docs

<p>After you download the Android Support Libraries, this library is located in the

{@code <sdk>/extras/android/support/customtabs} directory. For more information

{@code <sdk>/extras/android/support/percent} directory. For more information

on how to set up your project, follow the instructions in <a

href="{@docRoot}tools/support-library/setup.html#libs-with-res">Adding libraries

with resources</a>. </p>