Bazel docs: Clarify why the cache folder name includes 'buck'

Change-Id: I75b9b3a6f5c5c19ebffbb4e88b0ea921dd1d7c7e
Signed-off-by: Edwin Kempin <ekempin@google.com>
diff --git a/Documentation/dev-bazel.txt b/Documentation/dev-bazel.txt
index 4e598b0..2d51b5b 100644
--- a/Documentation/dev-bazel.txt
+++ b/Documentation/dev-bazel.txt
@@ -306,6 +306,9 @@
 the `downloaded-artifacts` directory, which holds the artifacts that got
 downloaded (not built locally).
 
+[NOTE] When building with Bazel the artifacts are still cached in
+`~/.gerritcodereview/buck-cache/`. This allows Bazel to make use of
+libraries that were previously downloaded by Buck.
 
 == Known issues and bugs