doc, rpc: add missing signet mentions in network name lists #20917

1. 
   theStack commented at 6:30 pm on January 12, 2021: member

   This small PR adds a few missing mentions of signet w.r.t. chain enumerations:

   • RPC getblockchaininfo: result description for "chain"
   • RPC getmininginfo: result description for "chain"
   • REST interface documentation:
     • default ports listing for each chain
     • "chain" description for chaininfo endpoint result

   The instances were identified via git grep -i "main.*test.*reg".

2. doc, rpc: add missing signet mentions in network name lists fc726e0138
3. DrahtBot added the label Docs on Jan 12, 2021
4. DrahtBot added the label Mining on Jan 12, 2021
5. DrahtBot added the label RPC/REST/ZMQ on Jan 12, 2021
6. benthecarman approved
7. 
   benthecarman commented at 8:40 pm on January 12, 2021: contributor

   ACK fc726e0138ab1fb1b757ccb4c86557c1c97be831
8. fanquake requested review from ajtowns on Jan 13, 2021
9. fanquake requested review from kallewoof on Jan 13, 2021
10. kallewoof approved
11. 
    kallewoof commented at 2:17 am on January 13, 2021: member

    utACK
12. 
    ajtowns commented at 4:44 am on January 13, 2021: member

    ACK fc726e0138ab1fb1b757ccb4c86557c1c97be831 – quick code review only
13. 
    DrahtBot commented at 11:45 am on January 13, 2021: member

    🕵️ @harding @jonasschnelli have been requested to review this pull request as specified in the REVIEWERS file.

14. MarcoFalke merged this on Jan 13, 2021
15. MarcoFalke closed this on Jan 13, 2021

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16. DrahtBot locked this on Aug 16, 2022

Contributors
theStack benthecarman kallewoof ajtowns DrahtBot

Review Requested
ajtowns

Labels
Docs RPC/REST/ZMQ Mining