Remove duplicate and incorrect docs in zstd_decompress.c

lib/decompress/zstd_decompress.c

@@ -796,11 +796,7 @@ static ZSTD_frameSizeInfo ZSTD_findFrameSizeInfo(const void* src, size_t srcSize
     }
 }
 
-/** ZSTD_findFrameCompressedSize() :
- *  compatible with legacy mode
- *  `src` must point to the start of a ZSTD frame, ZSTD legacy frame, or skippable frame
- *  `srcSize` must be at least as large as the frame contained
- *  @return : the compressed size of the frame starting at `src` */
+/** ZSTD_findFrameCompressedSize() : See docs in zstd.h */
 size_t ZSTD_findFrameCompressedSize(const void *src, size_t srcSize)
 {
     ZSTD_frameSizeInfo const frameSizeInfo = ZSTD_findFrameSizeInfo(src, srcSize);