Add example to extract specific files from tar archive

[parth-117]

Added an additional example in tar.md showing how to extract specific files from a tar archive using wildcard patterns.

This improves usability for users who only need to extract a subset of files from a compressed archive.

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[tldr-bot]

The build for this PR failed with the following error(s) at commit
b5975c53de2b575b0ebc831d5153bd9ae775a5b3:

pages/common/tar.md:41: TLDR008 File should contain no trailing whitespace
pages/common/tar.md:40: TLDR007 Example descriptions should be surrounded by empty lines
pages/common/tar.md:0: TLDR019 Page should only include a maximum of 8 examples

Please fix the error(s) and push again.

[Managor]

8 examples is an absolute limit.