[DOC] Update docs

[liuzhenqi77]

Routine update

[codecov-commenter]

Codecov Report

Merging #120 (00379b4) into master (73cd49d) will increase coverage by 5.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #120      +/-   ##
==========================================
+ Coverage   62.74%   67.77%   +5.03%     
==========================================
  Files          27       27              
  Lines        2067     2067              
==========================================
+ Hits         1297     1401     +104     
+ Misses        770      666     -104     

Impacted Files	Coverage Δ
netneurotools/metrics.py	27.48% <ø> (+2.29%)	⬆️
netneurotools/utils.py	86.53% <0.00%> (+3.84%)	⬆️
netneurotools/modularity.py	64.04% <0.00%> (+4.49%)	⬆️
netneurotools/tests/test_plotting.py	100.00% <0.00%> (+18.91%)	⬆️
netneurotools/plotting.py	65.31% <0.00%> (+32.47%)	⬆️

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