doc: remove unshipped doc references from help and warning text #34839

1. 
   AgusR7 commented at 5:51 am on March 17, 2026: none

   This is a small follow-up to #34693 and addresses the remaining C++ help/warning strings discussed in #32565.

   Some help and warning strings in bitcoind and bitcoin-wallet currently refer to markdown files under doc/ that are available in the source tree but are not shipped with Bitcoin Core binaries. This makes those messages less useful for users running distributed binaries.

   This PR removes those references from:

   • src/init.cpp
   • src/wallet/init.cpp

   The scope is intentionally narrow. It does not:

   • change behavior
   • ship documentation files
   • refactor the help system

   Testing:

   • git diff --check

   No new tests were added, since this change only updates user-facing help/warning text and does not modify behavior. Fixes #32565.

2. doc: remove unshipped doc references from help and warning text 4ed0cc624f
3. DrahtBot added the label Docs on Mar 17, 2026
4. 
   DrahtBot commented at 5:52 am on March 17, 2026: contributor

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   Conflicts

   Reviewers, this pull request conflicts with the following ones:

   • #31974 (Drop testnet3 by Sjors)

   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.

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