docs: fix multiple typos in Actions, Packages, and Billing

[umutKaracelebi]

Why:

This PR fixes several small typos and grammatical errors in the GitHub Actions, Packages, and Billing documentation to improve clarity and professional quality of the English content.

Closes: N/A (Minor documentation improvements)

What's being changed:

I have corrected four typos across different documentation areas:

1. Actions: Fixed an variable to a variable in use-variables.md.
2. Actions: Fixed a OIDC token to an OIDC token in oidc-with-reusable-workflows.md.
3. Packages: Fixed an complementary view to a complementary view in introduction-to-github-packages.md.
4. Billing: Fixed transfered to transferred in github-packages.md.

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.

[github-actions]

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Table of review links

Note: Please update the URL for your staging server or codespace.

The table shows the files in the content directory that were changed in this pull request. This helps you review your changes on a staging server. Changes to the data directory are not included in this table.

Source	Review	Production	What Changed
actions/how-tos/secure-your-work/security-harden-deployments/oidc-with-reusable-workflows.md	fpt ghec ghes@ 3.19 3.18 3.17 3.16 3.15 3.14	fpt ghec ghes@ 3.19 3.18 3.17 3.16 3.15 3.14
actions/how-tos/write-workflows/choose-what-workflows-do/use-variables.md	fpt ghec ghes@ 3.19 3.18 3.17 3.16 3.15 3.14	fpt ghec ghes@ 3.19 3.18 3.17 3.16 3.15 3.14
billing/concepts/product-billing/github-packages.md	fpt ghec	fpt ghec
packages/learn-github-packages/introduction-to-github-packages.md	fpt ghec ghes@ 3.19 3.18 3.17 3.16 3.15 3.14	fpt ghec ghes@ 3.19 3.18 3.17 3.16 3.15 3.14

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

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