Fix grammar and typos

[AxeldeWater]

Fixed some obvious typos and grammar mistakes. Unsure about whether the use of the word "customer" instead of client was a word joke or a language barrier, if it was a joke you can edit my pull request.

[rafatosta]

English is not my native language, so it will surely have grammatical errors or way of saying something different from what they are advised. Even passing a broker or translator is not 100%

[AxeldeWater]

That's alright! As long as your code works this is just a nuisance 👌