WSL/FAQ: update URLs to current docs

[ghost]

Description:
During a recent lookup in the FAQ based on a statement in a ticket in the MS ServerDocs pages, I noticed that 1 link points to an old and no longer maintained page (/previous-versions/) and some are permanently redirected from their previous site names (MSDN, TechNet) to their current pages.

This PR aims to improve the above noted issues as well as a couple of cosmetic details.

Changes proposed:

• [Remove-AppxPackage cmdlet] URL:
  (/previous-versions//hh856038(v=technet.10))
  => (https://docs.microsoft.com/powershell/module/appx/remove-appxpackage)

• [Do not change Linux files using Windows apps and tools] URL:
  (https://blogs.msdn.microsoft.com/commandline/2016/11/17/do-not-change-linux-files-using-windows-apps-and-tools/)
  => (https://devblogs.microsoft.com/commandline/do-not-change-linux-files-using-windows-apps-and-tools/)

• [Bash for Windows: Why it’s awesome and what it means for PowerShell] URL:
  (https://blogs.msdn.microsoft.com/powershell/2016/04/01/bash-for-windows-why-its-awesome-and-what-it-means-for-powershell/)
  => (https://devblogs.microsoft.com/powershell/bash-for-windows-why-its-awesome-and-what-it-means-for-powershell/)

• [command-line team blog] URL:
  (https://blogs.msdn.microsoft.com/commandline/)
  => (https://devblogs.microsoft.com/commandline/)

Whitespace changes, formatting, cosmetic typos etc.:

• Remove redundant blanks at end-of-line (12 occurrences)
• "filesystem" => 'file system' (3 occurrences)
• "Appdata" => 'AppData' (1 occurrence)

Ref. issue ticket https://github.com/MicrosoftDocs/windowsserverdocs/issues/5023

[opbld33]

Docs Build status updates of commit 215d11d:

✅ Validation status: passed

File	Status	Preview URL	Details
WSL/faq.md	✅Succeeded

For more details, please refer to the build report.

Note: Broken links written as relative paths are included in the above build report. For broken links written as absolute paths or external URLs, see the broken link report.

For any questions, please:

• Try searching in the Docs contributor and Admin Guide
• See the frequently asked questions
• Post your question in the Docs support channel

[ghost]

• Normal source view: https://github.com/MicrosoftDocs/WSL/pull/1038/files
• Hide whitespace changes: https://github.com/MicrosoftDocs/WSL/pull/1038/files?diff=unified&w=1 (shortened review length)
• Rich Diff view: https://github.com/MicrosoftDocs/WSL/pull/1038/files?short_path=b0ae266 (GitHub doc reading view)

[ghost]

#sign-off

[ghost]

#sign-off

[mattwojo]

Merged. Thanks @illfated! (Sorry this took me so long to get to... so much going on with WSL!)