Fix cli multi account typo

[NA-V10]

Why:

Fixes a clear documentation typo in the GitHub CLI multi-account guide.
The phrase “allow you allow you” was repeated, which affected readability and clarity.

What's being changed:

• Corrected the duplicated phrase to:
  “Some commands allow you to specify your target environment...”
• Documentation-only change, no commands or examples modified.

Check off the following:

• A subject matter expert (SME) has reviewed the technical accuracy (typo-only change).
• The changes meet GitHub Docs fundamentals.
• CI checks are passing and the changes look good in the review environment.

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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
github-cli/github-cli/quickstart.md	fpt ghec ghes@ 3.18 3.17 3.16 3.15 3.14	fpt ghec ghes@ 3.18 3.17 3.16 3.15 3.14
github-cli/github-cli/using-multiple-accounts.md	fpt ghec ghes@ 3.18 3.17 3.16 3.15 3.14	fpt ghec ghes@ 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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