Incorrect description of parameter "metadata" for "match_join_attempt"

Description for match_join_attempt’s metadata parameter mentions “Arbitrary key-value pairs”, implying the value can be of any type when building the metadata table in the client.

This thread details a real world error that arose from this description.

Suggested language to replace the current description: “Key-value pairs (both are strings) received from the client as part of the join request.”

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Thanks @RogLeite , we’ll get that updated :+1:

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