Clarify what "coverage" means in MRs
What does this MR do?
Related to #283893 (closed)
Clarify that "coverage" in the pipeline MR widget refers to "test coverage".
Also explain what the "delta" number means in the same context.
(did some driveby spec file cleanup)
Screenshots (strongly suggested)
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Does this MR meet the acceptance criteria?
Conformity
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I have not included a changelog entry because _____.
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Code review guidelines -
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Availability and Testing
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Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process. - [-] Tested in all supported browsers
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