Automatic merge from submit-queue
Fixed typos and issues in examples/volumes/glusterfs/README.md
**What this PR does / why we need it**:
This PR updates the GlusterFS `README.md` to fix several typos, outdated documentation and examples that did not work anymore.
**Which issue this PR fixes**
None
**Special notes for your reviewer**:
None
**Release note**:
`release-note-NONE`