Update auth.md

[CreativeBuilds]

The return value of the idToken() had a breaking style change for how markdown works as the "|" symbol cut off the rest of the line as Markdown thinks that | was closing the table.

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[CreativeBuilds]

@googlebot I signed it!

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[jamesdaniels]

@CreativeBuilds thanks for the catch, I actually went with escaping the pipe char instead.