Fix library name

Author: Noschvie

docs/I2S-Audio_ESP32.md

@@ -8,7 +8,7 @@
     build_flags                 = ${env:tasmota32_base.build_flags}
                                   -DUSE_I2S_ALL
     ```
-    Also requires `lib_extra_dirs = lib/lib_audio` added to the build environment
+    Also requires `lib_extra_dirs = lib/libesp32_audio` added to the build environment
 
     You can create smaller firmware versions with selective use of the build flags:
     ```