doc/resampler: fix some trivial typos

Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>

doc/resampler.texi

@@ -66,8 +66,8 @@ Set rematrix volume. Default value is 1.0.
 
 @item rematrix_maxval
 Set maximum output value for rematrixing.
-This can be used to prevent clipping vs. preventing volumn reduction
-A value of 1.0 prevents cliping.
+This can be used to prevent clipping vs. preventing volume reduction.
+A value of 1.0 prevents clipping.
 
 @item flags, swr_flags
 Set flags used by the converter. Default value is 0.