Renamed the file and title of the diagnostics chapter. #323
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When I recently searched for infos in this guide on how to create a warning, I couldn't find any. Later I found it through #14.
The reason was that I didn't know the term 'diagnostics' and that it is the collective term for errors, warnings and lints.
Renaming the chapter to include the word 'error' should help. I think also including 'warning' in the title shouldn't be neccessary, because it's close enough.