#629 Documentation updated for from field

[valerianpereira]

Resolves #629 documentation update for from field usage / implementation variations.

Fixes

Checklist

• I have made a material change to the repo (functionality, testing, spelling, grammar)
• I have read the [Contribution Guide] and my PR follows them.
• I updated my branch with the master branch.
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation about the functionality in the appropriate .md file
• I have added in line documentation to the code I modified

Short description of what this PR does:

• Documentation updated to add a sample snippet for from field customization.

If you have questions, please send an email to Sendgrid, or file a Github Issue in this repository.

[SendGridDX]

All committers have signed the CLA.

[reedsa]

Looks fine, thanks!

[valerianpereira]

Thanks @reedsa for reviewing the PR.

@reedsa / @thinkingserious - The travis-ci check says pending on this PR. However, on the details page it says successful. Is it alright?

[reedsa]

Not sure why GH was out of sync but just kicked it and things are ready to merge. I've added the deploy label so it should be merged soon! Thanks again.

[thinkingserious]

Hello @valerianpereira,

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

[thinkingserious]

Hello @valerianpereira,

Thanks again for the PR!

We noticed that you have earned 1 out of the 5 points needed to receive glorious SendGrid Hacktoberfest swag.

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[valerianpereira]

@thinkingserious I was not aware of this already.
Nevermind I will get started.

[thinkingserious]

Hello @valerianpereira,

Thanks again for the PR!

You have earned 1 out of the 5 points needed to receive glorious SendGrid Hacktoberfest swag.

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