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os_support: fix misleading comments

cherry-picked from speexdsp 86779a06f6500d041573d6252d4971d3bfcb4b18

--- a/celt/os_support.h

+++ b/celt/os_support.h

@@ -67,18 +67,18 @@

 }

 #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_OPUS_COPY

 #define OPUS_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_OPUS_MOVE

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

 #endif

-/** Set n elements of dst to zero, starting at address s */

+/** Set n elements of dst to zero */

 #ifndef OVERRIDE_OPUS_CLEAR

 #define OPUS_CLEAR(dst, n) (memset((dst), 0, (n)*sizeof(*(dst))))

 #endif