Fix formatting issues in the --help output text

[martin-cs]

• 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

Merging #5871 (a56d059) into develop (e969911) will decrease coverage by 0.00%.
The diff coverage is 89.39%.

@@             Coverage Diff             @@
##           develop    #5871      +/-   ##
===========================================
- Coverage    72.90%   72.90%   -0.01%     
===========================================
  Files         1423     1423              
  Lines       154216   154196      -20     
===========================================
- Hits        112428   112412      -16     
+ Misses       41788    41784       -4     

Impacted Files	Coverage Δ
src/analyses/global_may_alias.cpp	0.00% <0.00%> (ø)
src/analyses/uninitialized_domain.cpp	0.00% <0.00%> (ø)
src/goto-diff/change_impact.cpp	0.00% <ø> (ø)
src/goto-diff/goto_diff_parse_options.cpp	58.67% <ø> (ø)
src/goto-instrument/uninitialized.cpp	0.00% <0.00%> (ø)
src/goto-programs/remove_const_function_pointers.h	100.00% <ø> (ø)
src/goto-programs/restrict_function_pointers.h	100.00% <ø> (ø)
src/goto-symex/auto_objects.cpp	21.95% <0.00%> (+0.52%)	⬆️
src/goto-symex/goto_symex.h	92.30% <ø> (ø)
src/goto-symex/symex_function_call.cpp	92.89% <50.00%> (+0.50%)	⬆️
... and 22 more

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[martin-cs]

The code coverage results say that there has been a decrease in coverage. Given I have only changed string formats, I'm going to ignore that and merge it anyway.