fix license error

Author: 91volt

examples/theremin/README.md

@@ -163,4 +163,5 @@ If the interface works but there is no sound:
 - **Audio format:** 32-bit float, little-endian
 - **Latency:** ~30 ms block duration
 - **Frequency range:** ~20 Hz to ~8,000 Hz
-- **Envelope:** Attack (0.01s), Release (0.03s), Glide (0.02s)
+- **Envelope:** Attack (0.01s), Release (0.03s), Glide (0.02s)
+-