fix(reference): update function name in error message

[Fuco1]

Currently, the error message for the invalid first argument in the doc() function says "expected first argument to collection()"... instead of "to doc()". This seems to be a copy-paste of the validation logic from collection(). This commit corrects the name.

Today it caught me during debugging when it pointed me in incorrect direction, until I was so desperate to read the source code and find this little gem :)

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Latest commit: 4e8a5f6

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