Fix help formatting of checks

[tautschnig]

Adds a missing newline before --float-overflow-check.

• 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

Patch coverage has no change and project coverage change: -0.46% ⚠️

Comparison is base (d832f93) 78.90% compared to head (b4f25af) 78.44%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #7905      +/-   ##
===========================================
- Coverage    78.90%   78.44%   -0.46%     
===========================================
  Files         1697     1697              
  Lines       195369   195369              
===========================================
- Hits        154151   153253     -898     
- Misses       41218    42116     +898     

see 56 files with indirect coverage changes

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