Update doc "Supported Types and their Mappings"

[bill-poole]

As @roji said here, Npgsql fully supports writing binary (typically UTF8) data to text/jsonb. I assume this means:

• we can create a parameter with a byte[], ReadOnlyMemory<byte> or Stream value containing a UTF-8 encoded string when writing a text, json or jsonb field; and
• we can read a text, json or jsonb field from an NpgsqlDataReader as a byte[], ReadOnlyMemory<byte> or Stream.

If so, then this is inconsistent with the documentation, which states text, json and jsonb fields can only be read as string or char[] and written as string, char[] or char.

Furthermore, if I recall correctly, Npgsql supports reading/writing bytea fields as ReadOnlyMemory<byte>; however, this is also missing from the documentation.

The documentation also does not indicate that it is possible to read a bytea field with a Stream (although it does say it is possible to write a bytea field with a Stream). My understanding is that it is possible to read a bytea field with a Stream.

Apologies if any of the above is incorrect.

[roji]

Thanks, the docs are indeed a bit out of date. Pushed #392 to update them.