docs: simplify config help template description

.github/ISSUE_TEMPLATE/2-Config_help.md

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 name: Configuration help
-about: Help with your configuration, or maybe you're not sure. Please create an issue in Config Help instead: https://github.com/renovatebot/config-help/issues/new
+about: Please create an issue in renovatebot/config-help instead if you want config help or to ask a question.
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 Configuration help questions are very welcome! However, please raise them in the `renovatebot/config-help` repository first.