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os_support: fix misleading comments

cherry-picked from speexdsp 86779a06f6500d041573d6252d4971d3bfcb4b18

--- a/src/os_support.h

+++ b/src/os_support.h

@@ -88,18 +88,18 @@

 }

 #endif

-/** Copy n bytes of memory from src to dst. The 0* term provides compile-time type checking  */

+/** Copy n elements from src to dst. The 0* term provides compile-time type checking  */

 #ifndef OVERRIDE_SPEEX_COPY

 #define SPEEX_COPY(dst, src, n) (memcpy((dst), (src), (n)*sizeof(*(dst)) + 0*((dst)-(src)) ))

 #endif

-/** Copy n bytes of memory from src to dst, allowing overlapping regions. The 0* term 

+/** Copy n elements from src to dst, allowing overlapping regions. The 0* term

     provides compile-time type checking */

 #ifndef OVERRIDE_SPEEX_MOVE

 #define SPEEX_MOVE(dst, src, n) (memmove((dst), (src), (n)*sizeof(*(dst)) + 0*((dst)-(src)) ))

 #endif

-/** Set n bytes of memory to value of c, starting at address s */

+/** For n elements worth of memory, set every byte to the value of c, starting at address dst */

 #ifndef OVERRIDE_SPEEX_MEMSET

 #define SPEEX_MEMSET(dst, c, n) (memset((dst), (c), (n)*sizeof(*(dst))))

 #endif