Improved varname_and_value_leaves for Cholesky

[torfjelde]

You can see the difference in the docstring I've edited.

This was suggested by @sethaxen as an alternative, which I quite like:)

The alternative is to flatten the PDMat instead, i.e. we return the covariance / correlation matrix represented by the cholesky instead of the cholesky factor itself.

Related discussion: TuringLang/Turing.jl#2071

[github-actions]

Pull Request Test Coverage Report for Build 6057570891

• 3 of 3 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.01%) to 81.207%

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Totals
Change from base Build 6051965260:	0.01%
Covered Lines:	2381
Relevant Lines:	2932

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💛 - Coveralls

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.01% 🎉

Comparison is base (ba16e3b) 81.19% compared to head (99ea62c) 81.20%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #531      +/-   ##
==========================================
+ Coverage   81.19%   81.20%   +0.01%     
==========================================
  Files          24       24              
  Lines        2930     2932       +2     
==========================================
+ Hits         2379     2381       +2     
  Misses        551      551              

Files Changed	Coverage Δ
src/utils.jl	81.04% <100.00%> (+0.15%)	⬆️

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[yebai]

Nice improvements.