docs: Example for integration-specific `context` args. (#3455)
docs: Example for integration-specific `context` args. (#3455)

* Update authentication.md

I follow this example on Azure Function and it failed. After a little digging, I found out the req object is passed as "request". There may be some inconsistency in implementation.

* Adjust #3455 to account for new content in #3506.

This should hopefully make it more clear what information is available on
the argument to `context`, and how it might need to be adjusted for each
specific integration.

Co-authored-by: Jesse Rosenberger <46f1a0bd5592a2f9244ca321b129902a06b53e03@jro.cc>

apollostack/apollo-server