Replace update_chain_state_with ref with update_chain_tip_with in rustdoc

[dconnolly]

Motivation

Noted in the audit.

Solution

Update the rustdoc for with_block_and_spent_utxos() to mention the appropriate Chain method.

Review

Reviewer Checklist

• Will the PR name make sense to users?
• Are the PR labels correct?
• Does the code do what the ticket and PR says?
  • Does it change concurrent code, unsafe code, or consensus rules?

[codecov]

Codecov Report

Merging #6781 (949a70b) into main (636dd42) will decrease coverage by 0.15%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6781      +/-   ##
==========================================
- Coverage   78.06%   77.92%   -0.15%     
==========================================
  Files         308      308              
  Lines       40975    40975              
==========================================
- Hits        31988    31929      -59     
- Misses       8987     9046      +59     

[teor2345]

Sorry for the messy commits here, it's actually tricky to reference a trait method from another module!