Expand output binding invocation docs

[atrauzzi]

Description

Expanded the documentation for calling output bindings to call out some serialzation and encoding differences.

[WhitWaldo]

Couple of notes

[WhitWaldo]

I might instead call out of the importance of ensuring that whichever approach you're using to serialize the data, you should be clear that you're using the same approach to deserialize it.

[atrauzzi]

I can add that, though I don't want to imply that you're always the one responsible for the deserialization (think SFTP component).

[alicejgibbons]

small verbiage changes and then agree with what Whit has said

[WhitWaldo]

Looks great - thank you for putting this together!

[marcduiker]

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