Runner scale sets: a scale set can have more than one label

[aanshshah]

Why:

The Runner scale sets page says scale sets "can only have one label assigned to them". Since Actions Runner Controller 0.14.0, a scale set can carry multiple labels, and the Actions Runner Controller page already says: "You can also assign multiple labels to a scale set to enable more flexible job routing."

Source: Actions Runner Controller release 0.14.0.

What's being changed:

One sentence on the Runner scale sets page, section "About runner scale sets", so the two pages agree.

Check off the following:

• A subject matter expert (SME) has reviewed the technical accuracy of the content in this PR. In most cases, the author can be the SME. Open source contributions may require an SME review from GitHub staff.
• The changes in this PR meet the docs fundamentals that are required for all content.
• All CI checks are passing and the changes look good in the review environment.

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Source	Review	Production	What Changed
actions/concepts/runners/runner-scale-sets.md	fpt ghec ghes@ 3.22 3.21 3.20 3.19 3.18	fpt ghec ghes@ 3.22 3.21 3.20 3.19 3.18

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