DOC: Add polyG mention in the documentation

[ElDeveloper]

Fixes #2997

[codecov-commenter]

Codecov Report

Merging #3017 into dev will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##              dev    #3017   +/-   ##
=======================================
  Coverage   94.93%   94.94%           
=======================================
  Files          74       74           
  Lines       14239    14263   +24     
=======================================
+ Hits        13518    13542   +24     
  Misses        721      721           

Impacted Files	Coverage Δ
qiita_db/test/test_artifact.py	99.85% <100.00%> (+<0.01%)	⬆️
qiita_db/util.py	90.60% <100.00%> (ø)
qiita_db/test/test_software.py	99.82% <0.00%> (+<0.01%)	⬆️
qiita_db/software.py	97.61% <0.00%> (+0.04%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 947903e...3af082b. Read the comment docs.

[antgonza]

Thanks!