Cleaning up source.android.com files.

This change fixes some formatting artifacts that resulted from the export from
Sites, and also updates links to no longer point to Sites and use the standard
{@docRoot} idiom. Also contains a few content updates, and introduces a page
about branch management.
diff --git a/pdk/docs/source/licenses.jd b/pdk/docs/source/licenses.jd
index f1f646b..0d2cf2e 100644
--- a/pdk/docs/source/licenses.jd
+++ b/pdk/docs/source/licenses.jd
@@ -10,7 +10,7 @@
 <p>The preferred license for the Android Open Source Project is <a
 href="http://www.apache.org/licenses/LICENSE-2.0">Apache 2.0</a>. Apache 2.0
 is a commercial and open source friendly open source license. The majority of
-the Android platform is licensed under the<a
+the Android platform is licensed under the <a
 href="http://www.apache.org/licenses/">Apache 2.0 license</a>. While the
 project will strive to adhere to the preferred license, there may be
 exceptions which will be handled on a case-by-case basis. For example, the
@@ -24,7 +24,7 @@
 Source Project will be required to complete, sign, and submit an <a
 href="{@docRoot}source/cla-individual.html">Individual
 Contributor License Grant</a>. The grant can be executed online through the <a
-href="http://review.source.android.com/Gerrit#settings,agreements">code review
+href="https://review.source.android.com/#settings,agreements">code review
 tool</a>. The agreement clearly defines the terms under which intellectual
 property has been contributed to the Android Open Source Project.This license
 is for your protection as a contributor as well as the protection of the