admin cog.py improvements (mostly typo fixes)

[imtherealF1]

It is just some details, such as adding some brackets, full stops etc.

[flaree]

failing precommit

[imtherealF1]

pretty sure it failed cuz i forgot to add the main change i wanted, if it doesnt work there wouldnt be any need to work it out more as its just small changes for sth not many ppl see