Review example configs and documentation to make it more clear that topicPrefix v02.post is needed to subscribe to our public brokers

[reidsunderland]

(I created this without a description because I wanted to get the issue number for to email to the client).

I'm not sure if they created the config on their own or found an old example somewhere. But it didn't have topicPrefix v02.post so it didn't work. When I tested it, I had topicPrefix v02.post in my default.conf, so it worked for me.

Alternatively, we could set up shovels and start publishing v03 messages as well?

[petersilva]

yeah.... hard to figure out how to make that move obvious/clear...

fwiw... all the examples include it. e.g:

sr3 list examples
sr3 add subscribe/dd_amis.conf

[reidsunderland]

The client provided links to the documents they were reading:

• https://metpx.github.io/sarracenia/How2Guides/subscriber.html
• https://metpx.github.io/sarracenia/Tutorials/Setup_a_remote_subscriber.html

I added topicPrefix v02.post where it was needed.