Data-flow analyzers: don't document show-intervals, show-non-null

[tautschnig]

These are deprecated and users should be using --show --intervals and
--show --non-null, respectively.

• 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 #6932 (0f56bae) into develop (06350a0) will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@             Coverage Diff             @@
##           develop    #6932      +/-   ##
===========================================
- Coverage    77.79%   77.79%   -0.01%     
===========================================
  Files         1568     1568              
  Lines       180317   180318       +1     
===========================================
  Hits        140285   140285              
- Misses       40032    40033       +1     

Impacted Files	Coverage Δ
jbmc/src/janalyzer/janalyzer_parse_options.cpp	48.58% <ø> (ø)
jbmc/src/java_bytecode/java_bytecode_language.h	76.47% <ø> (ø)
jbmc/src/jbmc/jbmc_parse_options.cpp	76.06% <0.00%> (-0.19%)	⬇️
src/cbmc/cbmc_parse_options.cpp	80.10% <ø> (ø)
src/goto-analyzer/goto_analyzer_parse_options.cpp	72.27% <ø> (ø)

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[martin-cs]

Thank you!