Change "sample" to "stream" in AudioStreamWAV documentation

[Meorge]

Previously, AudioStreamWAV.loop_begin had this as its description:

The loop start point (in number of samples, relative to the beginning of the sample).

and likewise for AudioStreamWAV.loop_end.

Unless I'm misunderstanding what this is trying to say, I believe the word "stream" is a better fit. While some may think that "sample" can refer to the audio being stored in the stream, it has a well-defined meaning as a single point of data:

A sample is a value of the [sound] signal at a point in time and/or space; this definition differs from the term's usage in statistics, which refers to a set of such values.

The existing documentation uses the term "sample" correctly earlier in the sentence. Replacing the second instance of the word with "stream" makes it more clear what the variable means.

[Mickeon]

It's the small things that count.

[akien-mga]

Thanks!