docs: updates to contribution.md (#4383)
docs: updates to contribution.md (#4383)

Corrected some words, added links. In the case of `hand written` this
should be spelled as `hand-written` or `handwritten`. [See](https://ell.stackexchange.com/questions/128289/how-to-spell-correctly-hand-written-or-handwritten#:~:text=Handwritten%20and%20hand%2Dwritten%20are,but%20lost%20that%20in%20years.)
Semantic-Org/Semantic-UI-React,Semantic-Org/Semantic-UI-React