[PD] documenting messages to/from Pd and dynamic patching

[Alexandre Torres Porres]

People, I'm on a roll here, updating much of the help files and
documentation.

I just hit an important new addition, documenting "Messages to/from Pd" and
"Dynamic Patching"

I'd like you people to revise it.

Here's the commit =>
https://github.com/pure-data/pure-data/pull/1455/commits/0ec5429629eb1045c901ab9c74befd124ccb6e69

already in an open PR

Cheers
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