Simplify markup.

Doc/library/aifc.rst

@@ -30,8 +30,8 @@ sampling rate or frame rate is the number of times per second the sound is
 sampled.  The number of channels indicate if the audio is mono, stereo, or
 quadro.  Each frame consists of one sample per channel.  The sample size is the
 size in bytes of each sample.  Thus a frame consists of
-*nchannels*\*\ *samplesize* bytes, and a second's worth of audio consists of
-*nchannels*\*\ *samplesize*\*\ *framerate* bytes.
+``nchannels * samplesize`` bytes, and a second's worth of audio consists of
+``nchannels * samplesize * framerate`` bytes.
 
 For example, CD quality audio has a sample size of two bytes (16 bits), uses two
 channels (stereo) and has a frame rate of 44,100 frames/second.  This gives a