Fix typo in documentation

[tnasim-intel]

The parameter authenticate does not work anymore. Updated with authentication.
Same for httpProxy-authenticate --> proxyAuthentication

Testing done

Just documentation updated, so, didn't run any builds to test.

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[MarkEWaite]

Thanks!

I was able to generate matching syntax from the Pipeline Syntax Generator for each of the cases that mentioned authentication. I was able to generate proxyAuthentication: 'credential-id' from the the Pipeline snippet syntax generator. I was not able to generate proxyAuthentication: Basic from the Pipeline snippet syntax generator.

This is certainly an improvement and I'm happy to merge it. Can you offer any additional pointers so that I can duplicate the proxyAuthentication: Basic syntax interactively from the Pipeline snippet syntax generator?