Update accessing-github-using-two-factor-authentication.md by adding space between two words

[saurabhb-dev]

A space was necessary between GitHub and through. I added it now. Before my fix it was like this: GitHubthrough

Why:

Closes:

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

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• 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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Source	Review	Production	What Changed
authentication/securing-your-account-with-two-factor-authentication-2fa/accessing-github-using-two-factor-authentication.md	fpt ghec ghes@ 3.16 3.15 3.14 3.13 3.12	fpt ghec ghes@ 3.16 3.15 3.14 3.13 3.12

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

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[Sharra-writes]

@saurabhb-dev Perfect! Thanks for making this fix. I'll get it merged once checks are passing. 💛

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