Preview documentation on ngrok is potentially misleading

[SmartyP]

I was trying to debug why my previews weren't working (finally are now - yay!), and was referencing this document:
https://github.com/gatsbyjs/gatsby-source-wordpress-experimental/blob/master/docs/debugging-and-troubleshooting.md#previews-dont-update

At the bottom it says to use a preview instance URL of https://your-ngrok-url.ngrok.io/8000 and a refresh endpoint of https://your-ngrok-url.ngrok.io/8000/__refresh. I took this to mean that the /8000 portion of the ngrok URL was how ngrok did port routing, and so this odd formatting of ngrok.io/8000 instead of ngrok.io:8000 was intentional. I was noticing that hitting the /__refresh endpoint on ngrok wasn't causing my gatsby develop terminal to ever update.

Long story short, it wasn't until I changed https://your-ngrok-url.ngrok.io/8000 to https://your-ngrok-url.ngrok.io and https://your-ngrok-url.ngrok.io/8000/__refresh to https://your-ngrok-url.ngrok.io/__refresh in my WP GatsbyJS plugin settings that this whole process worked for me, and that was a bit of a time suck. I'm guessing since the terminal command is run with ngrok http 8000 that having the trailing /8000 is unnecessary, but that's just a guess - I'm not really familiar with this tool.

Thanks for your consideration, hoping this bug and/or an update to this documentation might help someone else!

[TylerBarnes]

Ahh, yep that's a mistake :) I just updated it. Thanks for calling this out and sorry for the confusion there!