Bazel: Update local cache activation instructions

Since [1] two action cache option were merged, and the experimental
prefix was removed. Also update the section about repository cache.
This cache is now activated per default and we can only change the
location of that cache.

[1] bazelbuild/bazel#4874

Change-Id: Iec4557a28987665182e9fe3f476d035421b751fe

Documentation/dev-bazel.txt

@@ -365,38 +365,25 @@ JGit repository.
 
 [[local-action-cache]]
 
-To accelerate builds, local action cache can be activated. Note, that this
-experimental feature is not activated per default and only available since
-Bazel version 0.7.
-
-To activate the local action cache, create accessible cache directory:
-
-----
- mkdir -p ~/.gerritcodereview/bazel-cache/cas
-----
-
-and add these lines to your `~/.bazelrc` file:
+To accelerate builds, local action cache can be activated.
+To activate the local action cache add these lines to your `~/.bazelrc` file:
 
 ----
-build --experimental_local_disk_cache_path=/home/<user>/.gerritcodereview/bazel-cache/cas
-build --experimental_local_disk_cache
+build --disk_cache=~/.gerritcodereview/bazel-cache/cas
 build --experimental_strict_action_env
 build --action_env=PATH
 ----
 
-[NOTE] `experimental_local_disk_cache_path` must be absolute path. Expansion of `~` is
-unfortunately not supported yet. This is also the reason why we can't activate this
-feature by default yet (by adjusting tools/bazel.rc file).
-
 [[repository_cache]]
 
-To accelerate fetches, local repository cache can be activated. This cache is
-only used for rules_closure external repository and transitive dependendcies.
-That's because rules_closure uses standard Bazel download facility. For all
-other gerrit dependencies, the download_artifacts repository cache is used
+To accelerate fetches, local repository cache is activated per default in Bazel.
+This cache is only used for rules_closure external repository and transitive
+dependendcies. That's because rules_closure uses standard Bazel download facility.
+For all other gerrit dependencies, the download_artifacts repository cache is used
 already.
 
-To activate the local repository cache, create accessible cache directory:
+To change the default local repository cache directry, create accessible cache
+directory:
 
 ----
  mkdir -p ~/.gerritcodereview/bazel-cache/repository
@@ -405,12 +392,9 @@ To activate the local repository cache, create accessible cache directory:
 and add this line to your `~/.bazelrc` file:
 
 ----
-build --experimental_repository_cache=/home/<user>/.gerritcodereview/bazel-cache/repository
+build --repository_cache=/home/<user>/.gerritcodereview/bazel-cache/repository
 ----
 
-[NOTE] `experimental_repository_cache` must be absolute path. Expansion of `~` is
-unfortunately not supported yet. This is also the reason why we can't activate this
-feature by default yet (by adjusting tools/bazel.rc file).
 GERRIT
 ------
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