doc: Update obsolete links to online reference #19582

1. 
   hebasto commented at 3:36 pm on July 24, 2020: member

   Links https://bitcoin.org/en/developer-reference#... in the protocol.h are obsolete and require to be updated with a scripted-diff.

   Useful skills:

   bash and basic knowledge of how to contribute patches via git on GitHub.

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   For guidance on contributing, please read CONTRIBUTING.md before opening your pull request.

2. hebasto added the label good first issue on Jul 24, 2020
3. 
   ecurrencyhodler commented at 3:51 pm on July 24, 2020: none

   I’ll try to take this issue. Thanks for pointing it out!
4. MarcoFalke referenced this in commit a78742830a on Aug 2, 2020
5. 
   MarcoFalke commented at 10:45 am on August 2, 2020: member

   Fixed in commit a78742830aa35bf57bcb0a4730977a1e5a1876bc
6. MarcoFalke closed this on Aug 2, 2020

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7. PastaPastaPasta referenced this in commit 47db4f87c4 on Jun 27, 2021
8. PastaPastaPasta referenced this in commit 50e1dc0c61 on Jun 28, 2021
9. PastaPastaPasta referenced this in commit 8538d51e1f on Jun 29, 2021
10. PastaPastaPasta referenced this in commit 725ab3dd2d on Jul 1, 2021
11. PastaPastaPasta referenced this in commit 70ba6d0ff6 on Jul 1, 2021
12. PastaPastaPasta referenced this in commit 7271c40dd3 on Jul 15, 2021
13. PastaPastaPasta referenced this in commit 413122de23 on Jul 16, 2021
14. MarcoFalke locked this on Feb 15, 2022

Contributors
hebasto ecurrencyhodler MarcoFalke

Labels
good first issue