Proposed Changes

Give a brief overview of your contribution here in a few sentences.
The comment and the code are inconsistent regarding RefElemLength. Propose to change the comment from 0.1m to 1.0m.

 /*--- Length based parameter for slope limiters uses a default value of
  0.1m ---*/

 RefElemLength = 1.0;

Related Work

Resolve any issues (bug fix or feature request), note any related PRs, or mention interactions with the work of others, if any.
Resolve #1830.

PR Checklist

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• I am submitting my contribution to the develop branch.
• My contribution generates no new compiler warnings (try with --warnlevel=3 when using meson).
• My contribution is commented and consistent with SU2 style (https://su2code.github.io/docs_v7/Style-Guide/).
• I have added a test case that demonstrates my contribution, if necessary.
• I have updated appropriate documentation (Tutorials, Docs Page, config_template.cpp), if necessary.