don't display redundant docstrings from Graphs.jl

[CarloLucibello]

let's see if this fixes #187

[codecov]

Codecov Report

Merging #192 (6a9fe54) into master (aeba9a3) will decrease coverage by 0.12%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #192      +/-   ##
==========================================
- Coverage   86.56%   86.43%   -0.13%     
==========================================
  Files          15       15              
  Lines        1347     1364      +17     
==========================================
+ Hits         1166     1179      +13     
- Misses        181      185       +4     

Impacted Files	Coverage Δ
src/GNNGraphs/gnngraph.jl	72.50% <0.00%> (-2.50%)	⬇️
src/layers/conv.jl	77.23% <0.00%> (-0.08%)	⬇️
src/GNNGraphs/sampling.jl	100.00% <0.00%> (ø)
src/GNNGraphs/query.jl	93.67% <0.00%> (+0.03%)	⬆️
src/GNNGraphs/transform.jl	96.96% <0.00%> (+0.05%)	⬆️
src/GNNGraphs/convert.jl	90.40% <0.00%> (+0.31%)	⬆️

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