Update running-code-scanning-in-your-ci-system.md

[casals]

Why:

Fixes #168 with the proposed changes.

What's being changed:

As suggested by the linked issue's author, added an explanatory sentence to the end of the section. The new sentence reads:

"On Windows, the codeql-runner-win.exe file usually requires no change to permissions."

Check off the following:

• All of the tests are passing.
• I have reviewed my changes in staging.
• For content changes, I have reviewed the localization checklist
• For content changes, I have reviewed the Content style guide for GitHub Docs.

[janiceilene]

Thank you so much for this fix @casals! I'll leave this to the @github/docs-content-dsp team to review 💖

[shati-patel]

Thank you @casals! This looks great 😊