Fix typos in billing actions minutes documentation

[jakebeamish]

Corrects 'multipler' to 'multiplier' and 'multiplers' to 'multipliers' in Minute multipliers section of github-actions.md

Why:

To fix typos

Closes:

What's being changed (if available, include any code snippets, screenshots, or gifs):

'multipler' -> 'multiplier'

'multiplers' -> 'multipliers'

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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Table of review links

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Source	Review	Production	What Changed
billing/concepts/product-billing/github-actions.md	fpt ghec	fpt ghec

Key: fpt: Free, Pro, Team; ghec: GitHub Enterprise Cloud; ghes: GitHub Enterprise Server

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[Sharra-writes]

@jakebeamish Looks good! I'll get this merged.

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