doc: Update the release document

Author: ityuhui

RELEASE.md

@@ -1,9 +1,15 @@
 # Release Process
 
-The Kubernetes Template Project is released on an as-needed basis. The process is as follows:
+The Kubernetes C Client Project is released on an as-needed basis. The process is as follows:
 
 1. An issue is proposing a new release with a changelog since the last release
 1. All [OWNERS](OWNERS) must LGTM this release
-1. An OWNER runs `git tag -s $VERSION` and inserts the changelog and pushes the tag with `git push $VERSION`
+1. An OWNER runs `git tag -s $VERSION` or `git tag -a $VERSION` (If GPG-signed tag is not required) and inserts the changelog and pushes the tag with `git push $VERSION`
+
+    e.g
+    ```shell
+    git tag -a v0.1.0 -m "version 0.1.0"
+    ```
+
 1. The release issue is closed
 1. An announcement email is sent to `[email protected]` with the subject `[ANNOUNCE] kubernetes-template-project $VERSION is released`