SDL3/SDL_NotificationID: docs for SDL_NotificationID

Live page is here: https://wiki.libsdl.org/SDL3/SDL_NotificationID

Author: Atompapst

SDL3/SDL_NotificationID.md

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+# SDL_NotificationID
+
+This is a unique identifier for a system notification.
+
+## Header File
+
+Defined in [<SDL3/SDL_events.h>](https://github.com/libsdl-org/SDL/blob/main/include/SDL3/SDL_events.h)
+
+## Syntax
+
+```c
+typedef Uint32 SDL_NotificationID;
+```
+
+## Remarks
+
+The value 0 is an invalid notification ID.
+
+## Version
+
+This datatype is available since SDL 3.6.0.
+
+----
+[CategoryAPI](CategoryAPI), [CategoryAPIDatatype](CategoryAPIDatatype), [CategoryEvents](CategoryEvents)