luma_third_party/rico_aosp: Fix patch paths.

Now that the patch has been released, fix the path referring to
experimental to r/p/luma_third_party, and replace a vanadium path with
$JIRI_ROOT.

Change-Id: Ie054dec65cc893a9f3bad961f0a763303b072923
diff --git a/rico_aosp/nexus6p/README.md b/rico_aosp/nexus6p/README.md
index f70f635..25dc45f 100644
--- a/rico_aosp/nexus6p/README.md
+++ b/rico_aosp/nexus6p/README.md
@@ -17,13 +17,13 @@
 ### Patching the source files
 ```bash
 cd frameworks/base
-patch -p1 < $JIRI_ROOT/experimental/projects/rico_aosp/nexus6p/patch/patch.diff
+patch -p1 < $JIRI_ROOT/release/projects/luma_third_party/rico_aosp/nexus6p/patch/patch.diff
  ```
 
 If you plan on installing Google Play services or other GmsCore apps on this
 build, you should also apply the following patch that fixes permission issues.
 ```bash
-patch -p1 < vanadium/release/projects/luma_third_party/gapps_aosp_patch/patch.diff
+patch -p1 < $JIRI_ROOT/release/projects/luma_third_party/gapps_aosp_patch/patch.diff
  ```
 
 ### Downloading Nexus 6P binaries