[Networking] Doxygen (#7030)

* [Networking] Doxygen

* Lint cause my autolinter is broken lol

* Update.

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Co-authored-by: tooomm <tooomm@users.noreply.github.com>

* Alphabetical ordering

Co-authored-by: tooomm <tooomm@users.noreply.github.com>

* Add new card art rule comment

* move filter program into doxygen folder

* [Networking] Doxygen


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Co-authored-by: Lukas Brübach <lukas.bruebach@bdosecurity.de>
Co-authored-by: tooomm <tooomm@users.noreply.github.com>
Co-authored-by: Lukas Brübach <Bruebach.Lukas@bdosecurity.de>

doc/doxygen/extra-pages/developer_documentation/network/client/index.md

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+@page developer_reference_network_client Client Networking (Overview)
+
+The clients response to various network protocol events and associated handling are described here.
+
+For information about game scoped events, see:
+
+- @subpage game_event_handler
+
+Certain game scoped events may be forwarded to player based handlers. For more information, see:
+
+- @subpage player_event_handler