Update doc/development/pipelines.md for rspec selective tests
What does this MR do and why?
I had troubles reading understanding how we were selectively running tests in an MR.
This MR improves a bit on the readability of the docs.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.