Fixed manpage formatting

doc/audiowaveform.1

@@ -58,7 +58,7 @@ Disables status messages.
 Input filename, which should be a MP3, WAV, FLAC, Ogg Vorbis, or Opus audio file,
 or a binary waveform data file. By default, \fBaudiowaveform\fR uses the file
 extension to decide how to read the input file (either .mp3, .wav, .flac, .ogg,
-.oga, .opus, or .dat, as appropriate), but this can be overridden by the
+\&.oga, .opus, or .dat, as appropriate), but this can be overridden by the
 \fB--input-format\fR option. If the \fB--input-filename\fR option is \fB-\fR or
 is omitted, \fBaudiowaveform\fR reads from standard input, and the
 \fB--input-format\fR option must be used to specify the data format.