cosmetics: Fix spelling mistakes

Signed-off-by: Diego Biurrun <diego@biurrun.de>

libavresample/dither.h

@@ -37,8 +37,8 @@ typedef struct DitherDSPContext {
      */
     void (*quantize)(int16_t *dst, const float *src, float *dither, int len);
 
-    int ptr_align;      ///< src and dst constraits for quantize()
-    int samples_align;  ///< len constraits for quantize()
+    int ptr_align;      ///< src and dst constraints for quantize()
+    int samples_align;  ///< len constraints for quantize()
 
     /**
      * Convert dither noise from int to float with triangular distribution.

libavresample/resample.c

@@ -46,7 +46,7 @@
 #include "resample_template.c"
 
 
-/* 0th order modified bessel function of the first kind. */
+/* 0th order modified Bessel function of the first kind. */
 static double bessel(double x)
 {
     double v     = 1;