Clearer documentation on what the non-event classes are

[joshctaylor]

Describe the bug The 2021 birdnet paper lists the following non-event classes.

• animals (e.g., insects, anurans, mammals),
• geophysical noise (e.g., wind, rain, thunder),
• human vocal and non-vocal sounds (e.g., whistling, footsteps, speech),
• anthropogenic sounds typically encountered in urban areas (e.g., cars, airplanes, sirens)
• electronic recorder noise

The version guide states there are 10 non-event classes in v2.4. What are the labels?

By searching BirdNET_GLOBAL_6K_V2.4_Labels.txt I only found the following:

• Human non-vocal_Human non-vocal
• Human vocal_Human vocal
• Human whistle_Human whistle
• Noise_Noise

[Josef-Haupt]

In addition to the ones you listed, here are also:

• Dog_Dog
• Engine_Engine
• Environmental_Environmental
• Fireworks_Fireworks
• Gun_Gun
• Power tools_Power tools
• Siren_Siren @kahst Did I forget anything?

[kahst]

Added info to FAQ in docs.