Fixed broken link to NetworkLayouts.jl in function documentation

[ThePurox]

"https://" appeared twice in the link, making it direct to the wrong page.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.53%. Comparing base (0d05009) to head (8fbc810).
⚠️ Report is 58 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #231      +/-   ##
==========================================
+ Coverage   78.28%   78.53%   +0.24%     
==========================================
  Files           5        5              
  Lines         723      764      +41     
==========================================
+ Hits          566      600      +34     
- Misses        157      164       +7     

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