Add run-fail to semver-check for docs
          #10287
        
          
      
                
     Merged
            
            
          
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I encountered this missing feature in #10276 and therefore added it here in this separate PR.
If the breaking change does not involve a compilation error but a change in runtime behaviour, you can add
run-failto the codeblock. The "before" code must return exit code 0, and the "after" code must be nonzero (like a panic).Example case that I tested (ignore the trailing dot, it's for github markdown to not hate me)