Update microsoft-defender-endpoint-linux to remove reference to x86

[josecons-msft]

Given that AMD64 and EM64T are in fact the implementation of x86-64, let's remove the 'x86_64' reference from this article, as it does generate some confusion.

https://en.wikipedia.org/wiki/X86-64

[learn-build-service-prod]

Learn Build status updates of commit 9ec3262:

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defender-endpoint/microsoft-defender-endpoint-linux.md	✅Succeeded

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[josecons-msft]

Forgot to mention that the confusion part comes from the 'x86' reference, i.e., some people will assume this means 32 bits is supported.

[denisebmsft]

Thank you @josecons-msft

[learn-build-service-prod]

Learn Build status updates of commit 7e4c57c:

✅ Validation status: passed

File	Status	Preview URL	Details
defender-endpoint/microsoft-defender-endpoint-linux.md	✅Succeeded

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel