fix doc build error

jepler · jepler · commit b1b4a9e8428f · 2020-01-06T09:26:32.000-06:00
diff --git a/shared-bindings/audiomp3/MP3Decoder.c b/shared-bindings/audiomp3/MP3Decoder.c
@@ -37,7 +37,7 @@
 //| .. currentmodule:: audiomp3
 //|
 //| :class:`MP3Decoder` -- Load a mp3 file for audio playback
-//| ========================================================
+//| =========================================================
 //|
 //| An object that decodes MP3 files for playback on an audio device.
 //|
