Add info about composer -v for extended verbosity

[tantebootsy]

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docs/troubleshooting/guide.md

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As you make use of composer's IOInterface, it would be nice to let newbies like me know, that troubleshooting can also be started via e.g. composer -v patches-repatch. The verbose-flag makes looking into failures much more easy in some cases.

[cweagans]

Thanks! This will go live on the docs site on Monday morning (a little slow, but that's just how the docs site is set up right now 🤷🏻‍♂️ )

[tantebootsy]

thank you, cameron