Updated demoDesignVars docstring

[sseraj]

Purpose

When I added the option to output the surface mesh with demoDesignVars in #104, I did not mention that the ADflow instance needs a mesh warping object. In this PR, I updated the docstring to include that.

Expected time until merged

3 days

Type of change

• [ ] Bugfix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (non-backwards-compatible fix or feature)
• [ ] Code style update (formatting, renaming)
• [ ] Refactoring (no functional changes, no API changes)
• [x] Documentation update
• [ ] Maintenance update
• [ ] Other (please describe)

Testing

Documentation only change

Checklist

• [x] I have run flake8 and black to make sure the Python code adheres to PEP-8 and is consistently formatted
• [ ] I have formatted the Fortran code with fprettify or C/C++ code with clang-format as applicable
• [x] I have run unit and regression tests which pass locally with my changes
• [ ] I have added new tests that prove my fix is effective or that my feature works
• [x] I have added necessary documentation

[codecov[bot]]

Codecov Report

Merging #171 (c0c6e91) into main (5d42e7d) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #171   +/-   ##
=======================================
  Coverage   64.14%   64.14%           
=======================================
  Files          47       47           
  Lines       11866    11866           
=======================================
  Hits         7611     7611           
  Misses       4255     4255           

Impacted Files	Coverage Δ
pygeo/parameterization/DVGeo.py	66.39% <ø> (ø)

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