Place notes about Doubles in methods for C# users

**Your Godot version:**4.1-Mono

**Issue description:**
In the Method declaration, `float` is the type listed for the type of delta for both the `_process` and `_physics_process` method. I discovered the issue when writing C# code for the `_Process` C# binding. It uses the type `double` for delta in the C# binding. I assumed they are of the same type at first glance. It wouldn't occur normally for me to click on `float` because I know what a float is. There should have been a note about this for C# users that wouldn't think about checking the documentation for the `float` type. Yes, while it does list in the documentation about `float`s; it's inconvenient.

**URL to the documentation page:** https://docs.godotengine.org/en/stable/classes/class_node.html#class-node-method-physics-process

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