Update documentation to use drawcells instead of drawhexcells

[BrianGun]

Fixes #281
Fixes #280

fixed call to Vis.drawcells to use the new interface instead of Vis.drawhexcells

Pull Request Template

Description

Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.

Fixes # (issue)

Type of change

• [ x] 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)
• This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

verified that documentation has correct figures after the change

Checklist:

• [ x] My code follows the style guidelines of this project
• [x ] I have performed a self-review of my own code
• [ x] I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• [x ] My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• [x ] New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• [ x] I have checked my code and corrected any misspellings

[codecov-commenter]

Codecov Report

Merging #282 (94d3791) into main (98a5b5b) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #282   +/-   ##
=======================================
  Coverage   54.46%   54.46%           
=======================================
  Files          78       78           
  Lines        7071     7071           
=======================================
  Hits         3851     3851           
  Misses       3220     3220           

Impacted Files	Coverage Δ
src/Vis/VisRepeatingStructures.jl	93.02% <100.00%> (ø)

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[alfredclwong]

Looks good