docs: Add article on batterstats, create power dir.

Bug ID: 18334705

Change-Id: I9ce773d42f27d2cb94120d01bede002a0c73d652

Change-Id: I992d76ec7c640de45eeccd48cebb03e61eec8eff

docs: Add Batterysys article, create Power dir, and change nav.

Bug ID: 18334705
diff --git a/src/devices/tech/debug/dumpsys.jd b/src/devices/tech/debug/dumpsys.jd
index f971bb3..ad93e2f 100644
--- a/src/devices/tech/debug/dumpsys.jd
+++ b/src/devices/tech/debug/dumpsys.jd
@@ -99,8 +99,6 @@
   href="{@docRoot}devices/input/diagnostics.html">Viewing Input Diagnostics (dumpsys input)</a>
   <li> <a href="{@docRoot}devices/tech/ram/procstats.html">Viewing RAM Usage Data (dumpsys procstats)</a>
   <li> <a href="{@docRoot}devices/tech/netstats.html">Viewing Network Data (dumpsys netstats)</a>
-<!--  To add in upcoming CLs
-  <li> <a href="{@docRoot}devices/tech/power/batterystats.html">Batterystats</a>
--->
+  <li> <a href="{@docRoot}devices/tech/power/batterystats.html">Viewing Battery Usage Data (dumpsys batterystats)</a>
 </ul>