Update View runner statistics topic to make median info more prominent

What does this MR do?

Moves information about how median values are calculated to the start of the section, https://docs.gitlab.com/ee/ci/runners/runners_scope.html#view-statistics-for-runner-performance to provide better context about values.

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added docsimprovement documentation maintenancerefactor typemaintenance labels

assigned to @fneill

added devopsverify grouprunner labels

added sectionci label

added Technical Writing label

changed milestone to %16.3

	2 Warnings
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	1 Message
	This merge request adds or changes documentation files. A review from the Technical Writing team before you merge is recommended. Reviews can happen after you merge.

Documentation review

The following files require a review from a technical writer:

• doc/ci/runners/runners_scope.md (Link to current live version)

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changed title from Update runners_scope.md to Update View runner statistics topic to make median info more prominent

added docs-only label

Hey @msedlakjakubowski another small MR for you Would you mind reviewing and merging whenever suits? Thanks!

requested review from @msedlakjakubowski

resolved all threads

approved this merge request

merged

mentioned in commit fc373e61

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