[DevTools] Update ReadMe Docs For WebExtensions

[ospira]

Summary

All three browser extension ReadMe files reference a path (shells/webextension) for common source code that I believe no longer exists.

I have a guess where the correct path now is, but given it should be easy for the maintainers to make this correction themselves (accurately and without guessing), I'm simply flagging it.

Thus for this PR to be completed it would need to replace the struck out characters with an updated, correct path. If I have made a mistake I apologize, but as you can see in that screenshot I could not find shells/webextension... I was able to find a top-level shells directory in the git history, but I must admit the git history is a little confusing, perhaps because this code used to live in a separate repo once upon a time?

In any event, it would be great if one of the maintainers could spend a few minutes confirm the issue and give a quick update for people coming to this fresh who want to dive into this particular aspect of the source code. Thanks for your time!

How did you test this change?

N/A

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Closing this pull request after a prolonged period of inactivity. If this issue is still present in the latest release, please ask for this pull request to be reopened. Thank you!