Delete redundant instruction about Release folder.

Change-Id: I8a98bd08db886652b5a75a26495844fdb62633e0
Reviewed-on: https://chromium-review.googlesource.com/487061
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Commit-Queue: Yipeng Wang <yipengw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#467087}

docs/android_build_instructions.md

@@ -214,8 +214,7 @@ build/android/adb_install_apk.py out/Default/apks/ContentShell.apk
 ```
 
 this will build and install an Android apk under
-`out/Default/apks/ContentShell.apk`. (Where `Release` is the name of your build
-directory.)
+`out/Default/apks/ContentShell.apk`.
 
 If you use custom out dir instead of standard out/ dir, use
 CHROMIUM_OUT_DIR env.