change(docs): Replaces XXX with TODO

[arya2]

Motivation

Annotations in the codebase that contain the string XXX and appear to represent a TODO or future task may not be identified or documented via code searches for open issues.

Closes #6342.

Solution

• Replace "XXX" with "TODO:" where applicable

Review

Optional priority, anyone can review.

Reviewer Checklist

• Will the PR name make sense to users?
  • Does it need extra CHANGELOG info? (new features, breaking changes, large changes)
• 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?
• How do you know it works? Does it have tests?

[oxarbitrage]

Thanks, looks like this one missing https://github.com/ZcashFoundation/zebra/blob/main/zebra-chain/src/block/tests.rs#L3 ?

[oxarbitrage]

thanks!

[codecov]

Codecov Report

Merging #6417 (f5100ca) into main (8ba3fd9) will decrease coverage by 0.14%.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6417      +/-   ##
==========================================
- Coverage   77.79%   77.66%   -0.14%     
==========================================
  Files         304      304              
  Lines       39585    39585              
==========================================
- Hits        30797    30745      -52     
- Misses       8788     8840      +52