Add more details to documentation of AudioStreamRandomizer.random_pitch

[xinraTV]

Your Godot version: 4.3

Issue description:
Current documentation:

The intensity of random pitch variation. A value of 1 means no variation.

This doesn't explain what other values will do. For example, if I want to achieve a range of 95% to 105% of the original pitch - what value do I need to set?

URL to the documentation page (if already existing): https://docs.godotengine.org/en/stable/classes/class_audiostreamrandomizer.html#class-audiostreamrandomizer-property-random-pitch