Update CODEOWNERS

[jimgrundy]

This PR would broaden code-ownership for the documentation directory to include some extra folks with broad project responsibilities who should be able to review the quality of documentation. This should accelerate progress when someone makes a documentation change as today that can necessitate review from a small set of people.

• Each commit message has a non-empty body, explaining why the change was made.
• Methods or procedures I have added are documented, following the guidelines provided in CODING_STANDARD.md.
• The feature or user visible behaviour I have added or modified has been documented in the User Guide in doc/cprover-manual/
• Regression or unit tests are included, or existing tests cover the modified code (in this case I have detailed which ones those are in the commit message).
• My commit message includes data points confirming performance improvements (if claimed).
• My PR is restricted to a single feature or bugfix.
• White-space or formatting changes outside the feature-related changed lines are in commits of their own.

[codecov]

Codecov Report

Base: 78.35% // Head: 78.37% // Increases project coverage by +0.01% 🎉

Coverage data is based on head (b937d48) compared to base (25c32cc).
Patch coverage: 96.38% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #7387      +/-   ##
===========================================
+ Coverage    78.35%   78.37%   +0.01%     
===========================================
  Files         1645     1647       +2     
  Lines       190208   190327     +119     
===========================================
+ Hits        149040   149171     +131     
+ Misses       41168    41156      -12     

Impacted Files	Coverage Δ
src/ansi-c/c_typecheck_base.h	100.00% <ø> (ø)
.../goto-instrument/contracts/dynamic-frames/dfcc.cpp	97.56% <83.33%> (+8.25%)	⬆️
src/ansi-c/c_typecheck_expr.cpp	75.59% <93.93%> (+0.24%)	⬆️
src/goto-instrument/contracts/contracts.cpp	95.38% <100.00%> (+0.06%)	⬆️
...ument/contracts/dynamic-frames/dfcc_instrument.cpp	81.12% <100.00%> (+0.16%)	⬆️
...strument/contracts/dynamic-frames/dfcc_library.cpp	95.63% <100.00%> (ø)
...t/contracts/dynamic-frames/dfcc_obeys_contract.cpp	100.00% <100.00%> (ø)
...ent/contracts/dynamic-frames/dfcc_obeys_contract.h	100.00% <100.00%> (ø)
...t/contracts/dynamic-frames/dfcc_spec_functions.cpp	73.65% <100.00%> (+0.43%)	⬆️
...nt/contracts/dynamic-frames/dfcc_swap_and_wrap.cpp	86.36% <100.00%> (ø)
... and 6 more

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