Change standard example port to 3200

[joe-elliott]

All of our examples use port 3100 as the Tempo http port. This collides with the standard example in Loki that also uses 3100. This occasionally confuses users when they attempt to run standard Loki and Tempo configs in the same network namespace.

Change all in repo examples/docs/whatever to use 3200.

[MurzNN]

Yeah, I got very confused when see same default port on Tempo and Loki docs, especially when Tempo also needs loki-url option to same port in example/docker-compose/loki/docker-compose.yaml :)

[MurzNN]

I created PR with this replacement: #809 - hope I'm not replace more than needed. 3100 port, that mentioned with Loki, is kept.