doc: Note that generateblock does not collect transaction fees #34891

1. 
   HouseOfHufflepuff commented at 0:11 am on March 22, 2026: none

   Summary

   • Add a note to the generateblock RPC help text clarifying that transaction fees are not collected in the block reward
   • This was suggested by maflcko in #31684 as a minimal doc fix

   refs #31684

   Test plan

   • ./build/bin/test_bitcoin --run_test=rpc_tests passes
   • cmake --build build --target bitcoind compiles cleanly
2. doc: Note that generateblock does not collect transaction fees

   The generateblock RPC creates blocks where the coinbase only includes
   the block subsidy, omitting transaction fees. Document this behavior
   in the RPC help text to avoid confusion.
   
   refs #31684

   3136559923
3. DrahtBot added the label Docs on Mar 22, 2026
4. 
   DrahtBot commented at 0:11 am on March 22, 2026: contributor

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   Conflicts

   Reviewers, this pull request conflicts with the following ones:

   • #34049 (rpc: Disallow captures in RPCMethodImpl by ajtowns)

   If you consider this pull request important, please also help to review the conflicting pull requests. Ideally, start with the one that should be merged first.

5. 
   HouseOfHufflepuff commented at 0:11 am on March 22, 2026: none

   @maflcko

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