docs: Fix typos and grammar

[aaronang]

No description provided.

[SendGridDX]

All committers have signed the CLA.

[thinkingserious]

Hello @aaronang,

Thanks again for the PR!

It's HACKTOBERFEST! We want to show our appreciation by sending you some special Hacktoberfest swag. If you have not already, could you please fill out this form so we can send it to you? Thanks!

Team SendGrid DX

[mbernier]

@aaronang
If you are interested, we would love the opportunity to talk to you about Hacktoberfest and our API libraries.

Our agenda would be: Explore what you liked and is there anything we can do to improve?

You can grab a time on my calendar that works for you and we can have a chat on Google Hangout or Skype. If you prefer, you can email me using my GitHub username at my company’s domain.

Thank you so much,

Matt Bernier - @mbernier - SendGrid Developer Experience Product Manager
Elmer Thomas - @thinkingserious - SendGrid Developer Experience Engineer
@sendgrid