[zcash/zcash] Help users understand “transaction not mined” situations (#1959)

@copernicus-mogley, please update https://z.cash/support/faq.html so that:

1. the sentence right near the title, “For troubleshooting, please see our Github wiki.” is reworded to “For troubleshooting the zcashd client, please see our Github wiki.”
2. the question “[Are my funds safe during the transition?](https://z.cash/support/faq.html#safe-zcash-upgrade)” is updated with the text above (or if it’s easier, it’s also in this [google doc](https://docs.google.com/document/d/1Ducz4iNN3OEC5WwQkQRa1z7wh96AukZKgmjcA0N2SK0/edit?usp=sharing)).
3. add a question “What do I do if my transaction is not being mined?” to the bottom on the first section; specifically, in the “Zcash Ecosystem” section after the ” What is the difference between Zcash and Bitcoin?” question. The text is above or in this [google doc](https://docs.google.com/document/d/1Ducz4iNN3OEC5WwQkQRa1z7wh96AukZKgmjcA0N2SK0/edit?usp=sharing).

Let me or @ioptio know if there are any questions!

This post was last modified on May 7, 2018, 11:06 pm