User Guide Docs update required for Decode As

[Graham Bloice <graham.bloice () trihedral com>]

In case someone has spare time on their hands, a question on Ask Wireshark (
https://ask.wireshark.org/questions/51575/using-filters-for-j1939-can-bus)
was essentially asking about Decode As and it caused me to check the docs
which seem to be out of date (
https://www.wireshark.org/docs/wsug_html_chunked/ChCustProtocolDissectionSection.html
).

-- 
Graham Bloice

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