Check completeness of man pages

[tautschnig]

Extend the checks of --help output to also cover man pages.

• Each commit message has a non-empty body, explaining why the change was made.
• n/a Methods or procedures I have added are documented, following the guidelines provided in CODING_STANDARD.md.
• n/a 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).
• n/a My commit message includes data points confirming performance improvements (if claimed).
• My PR is restricted to a single feature or bugfix.
• n/a White-space or formatting changes outside the feature-related changed lines are in commits of their own.

[codecov]

Codecov Report

Base: 77.82% // Head: 77.89% // Increases project coverage by +0.07% 🎉

Coverage data is based on head (e01f9df) compared to base (2a08d59).
Patch coverage: 91.45% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #7169      +/-   ##
===========================================
+ Coverage    77.82%   77.89%   +0.07%     
===========================================
  Files         1578     1616      +38     
  Lines       182242   186701    +4459     
===========================================
+ Hits        141824   145437    +3613     
- Misses       40418    41264     +846     

Impacted Files	Coverage Δ
src/goto-instrument/contracts/contracts.cpp	95.11% <90.47%> (-1.18%)	⬇️
src/assembler/remove_asm.cpp	78.66% <93.10%> (+27.28%)	⬆️
src/goto-instrument/contracts/contracts.h	100.00% <100.00%> (ø)
src/goto-instrument/nondet_static.cpp	96.92% <100.00%> (ø)
src/goto-programs/string_instrumentation.cpp	25.11% <100.00%> (ø)
src/solvers/smt2/smt2_conv.h	84.61% <0.00%> (-15.39%)	⬇️
src/goto-programs/goto_program.h	90.19% <0.00%> (-0.51%)	⬇️
src/cprover/bv_pointers_wide.cpp	57.77% <0.00%> (ø)
src/cprover/address_taken.cpp	100.00% <0.00%> (ø)
src/cprover/cprover_parse_options.cpp	56.58% <0.00%> (ø)
... and 47 more

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