Document all architecture and back-end options

[tautschnig]

Ensure that all supported options are also included in the corresponding
help strings.

• 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

Merging #6927 (a1053a6) into develop (4790e60) will increase coverage by 0.00%.
The diff coverage is 92.56%.

@@           Coverage Diff            @@
##           develop    #6927   +/-   ##
========================================
  Coverage    77.79%   77.79%           
========================================
  Files         1568     1568           
  Lines       180295   180316   +21     
========================================
+ Hits        140258   140285   +27     
+ Misses       40037    40031    -6     

Impacted Files	Coverage Δ
jbmc/src/jbmc/jbmc_parse_options.cpp	76.24% <ø> (-0.17%)	⬇️
jbmc/src/jdiff/jdiff_parse_options.cpp	66.66% <ø> (-0.69%)	⬇️
jbmc/src/jdiff/jdiff_parse_options.h	100.00% <ø> (ø)
...de/java_bytecode_parser/parse_java_annotations.cpp	99.31% <ø> (-0.01%)	⬇️
...straint_instantiation/instantiate_not_contains.cpp	0.00% <0.00%> (ø)
src/goto-checker/solver_factory.h	100.00% <ø> (ø)
src/goto-diff/goto_diff_parse_options.cpp	60.22% <ø> (ø)
src/goto-instrument/wmm/goto2graph.cpp	54.57% <ø> (+0.07%)	⬆️
...rs/strings/string_concatenation_builtin_function.h	0.00% <ø> (ø)
src/solvers/strings/string_constraint_generator.h	100.00% <ø> (ø)
... and 28 more

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