improve guidance in coverage-failures-to-investigate.txt about restler-fuzzer HOT 2 OPEN

For example:

When there isn't any response in the coverage file, it means RESTler could not connect to the service or there is a timeout

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Hi Marina ! Thanks so much for RESTler, I started using it (macOS but inside the docker container)
I would also add a reminder about --use_ssl because I used it directly on a staging/test environment and couldn't understand why I was not getting any coverage 😅

Another idea I had, but much bigger scope, was an interactive mode, because it's frustrating to see the coverage failures and just play with the config JSON for now, when I wished I could give some pointers for each specific path RESTler tries to explore. Maybe my choices could be saved as "guidance" for later use ?

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