MudProgressLinear: fix XMLDoc of Value parameter

[markushaslinger]

Description

The Value parameter used the same XMLDoc summary/description as the Max parameter.
Changed that to describe what value should be set for this parameter: the current one to display, which should be between min & max.

Type of Changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation (fix or improvement to the website or code docs)

Checklist

• The PR is submitted to the correct branch (dev).
• My code follows the code style of this project.
• I've added relevant tests.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.11%. Comparing base (28bc599) to head (51efe62).
Report is 112 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #8803      +/-   ##
==========================================
+ Coverage   89.82%   90.11%   +0.28%     
==========================================
  Files         412      420       +8     
  Lines       11878    12206     +328     
  Branches     2364     2407      +43     
==========================================
+ Hits        10670    10999     +329     
+ Misses        681      664      -17     
- Partials      527      543      +16     

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[henon]

Thanks!