nir/opt_peephole_ffma: Fix a couple typos in a comment
nir/opt_peephole_ffma: Fix a couple typos in a comment

Acked-by: Matt Turner <789b315743a28dd066a4ba1459c35951c291d8a6@gmail.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler