Removed unnecessary colons and fixed typos in the documentation

[dongkwan-kim]

No description provided.

[codecov]

Codecov Report

Merging #4616 (c4477ad) into master (f35c85f) will decrease coverage by 0.11%.
The diff coverage is n/a.

❗ Current head c4477ad differs from pull request most recent head 968075e. Consider uploading reports for the commit 968075e to get more accurate results

@@            Coverage Diff             @@
##           master    #4616      +/-   ##
==========================================
- Coverage   83.00%   82.88%   -0.12%     
==========================================
  Files         316      316              
  Lines       16677    16674       -3     
==========================================
- Hits        13842    13820      -22     
- Misses       2835     2854      +19     

Impacted Files	Coverage Δ
torch_geometric/data/lightning_datamodule.py	26.08% <ø> (ø)
torch_geometric/nn/conv/cluster_gcn_conv.py	100.00% <ø> (ø)
torch_geometric/nn/conv/han_conv.py	100.00% <ø> (ø)
torch_geometric/nn/conv/hgt_conv.py	96.93% <ø> (ø)
torch_geometric/nn/conv/pna_conv.py	94.64% <ø> (ø)
torch_geometric/nn/conv/point_transformer_conv.py	100.00% <ø> (ø)
torch_geometric/nn/fx.py	89.04% <ø> (ø)
torch_geometric/nn/models/deepgcn.py	17.77% <ø> (ø)
torch_geometric/nn/models/dimenet.py	17.66% <ø> (ø)
torch_geometric/nn/to_hetero_transformer.py	95.20% <ø> (ø)
... and 12 more

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[rusty1s]

Thank you!