add some details to releaseing.md

Change-Id: I4367cb284c0f26b6f0eea07ae8e76ca84df080fe
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/72527
Reviewed-by: David Benjamin <davidben@google.com>
Auto-Submit: Bob Beck <bbe@google.com>
Commit-Queue: Bob Beck <bbe@google.com>
diff --git a/docs/releasing.md b/docs/releasing.md
index a5dc2fc..e610ed8 100644
--- a/docs/releasing.md
+++ b/docs/releasing.md
@@ -15,13 +15,25 @@
    again is fine.)
 
 4. Wait for the tag to be mirrored to GitHub, and create a corresponding
-   GitHub [release](https://github.com/google/boringssl/releases/new).
+   GitHub [release](https://github.com/google/boringssl/releases/new). You
+   have to be a boringssl owner on github for this to work, if it the new link
+   does not work, bug davidben to invite you to the repository.
 
 5. Download the "Source code (tar.gz)" archive from the new release and
-   re-attach it to the release. (The next step will check that the archive is
+   re-attach it to the release by clicking the edit button, and selecting "Attach New File"
+   overtop of the release artifacts in github.  (The next step will check that the archive is
    correct.)
 
+6. Clone a copy of https://github.com/bazelbuild/bazel-central-registry so that you
+   can make a github pull request against it.
+
 6. Run `go run ./util/prepare_bcr_module TAG` and follow the instructions. The
    tool does not require special privileges, though it does fetch URLs from
    GitHub and read the local checkout. It outputs a JSON file for BCR's tooling
-   to consume.
+   to consume. The instructions will tell you to run a bazelisk command.
+
+7. CD into the root of your bazel-central-registry fork, and run the bazelisk
+   command indicated by the script output above. It will add a directory to the
+   repository which is untracked, use "git status " to find it, and "git add" to
+   add it to what you are about to commit.  Then commit the changes and added
+   directory, and submit it as a pr to bazel-central-registry.