troubleshooting.md: use /usr/local/opt/openssl for link source

[cielavenir]

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[msftclas]

Hi @cielavenir, I'm your friendly neighborhood Microsoft Pull Request Bot (You can call me MSBOT). Thanks for your contribution!

This seems like a small (but important) contribution, so no Contribution License Agreement is required at this point. Real humans will now evaluate your PR.

TTYL, MSBOT;

[daviwil]

Thanks @cielavenir! I don't have my MacBook handy, is the new path a symbolic link which Homebrew creates so that we don't need to point to a specific install of OpenSSL?

[cielavenir]

Uh, actually I'm new to Homebrew... (I just installed VSCode extension and followed the information link to come here)
[It looks like] /usr/local/Library/LinkedKegs used to be used as versioning-free space, but it is now moved to /usr/local/opt (according to https://github.com/Homebrew/brew/blob/master/Library/Homebrew/utils.rb#L547 ).

[daviwil]

@cielavenir thanks again for sending this PR. I finally got a chance to verify this path on my MacBook and it seems that this path works! Thanks a lot for locating this fix, it should help people avoid changing their link for future OpenSSL versions.