Area2D: Fix argument type of body_* signals

Those signals receive either a PhysicsBody2D or a TileMap object,
and what the emitting method checks internally is only that the
object is a Node. In theory any Node could go through these signals
if they talk directly to the PhysicsServer2D.

Also updated docs.

Fixes #27076.

Might need further (compat breaking) improvement as this API is a
bit confusing, cf. #24739.

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