Improve output for IrqlSet* queries to be more clear

[NateD-MSFT]

Resolves #201.

Note that because this only changes the output message to be more clear and not the query behavior, I have not incremented the query version.

Checklist for Pull Requests

• Description is filled out.
• Only one query or related query group is in this pull request.
• The version number on changed queries has been increased via the @version comment in the file header.
• All unit tests have been run: (Test README.md).
• Commands codeql database create and codeql database analyze have completed successfully.
• A .qhelp file has been added for any new queries or updated if changes have been made to an existing query.