Update README.md to fix two small issues in runner registration section
What does this MR do?
- fixes an error in the gitlab runner doc
- updates an example in this doc to be less confusing
Why was this MR needed?
- the note in the doc was in contradiction to the command line argument usage in the example
What's the best way to test this MR?
- view the updated readme
What are the relevant issue numbers?
n.a.
Edited by psIQos