Fix nxstyle issue

Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>

include/stdio.h

@@ -172,7 +172,9 @@ void   setbuf(FAR FILE *stream, FAR char *buf);
 int    setvbuf(FAR FILE *stream, FAR char *buffer, int mode, size_t size);
 int    ungetc(int c, FAR FILE *stream);
 
-/* Operations on the stdout stream, buffers, paths, and the whole printf-family */
+/* Operations on the stdout stream, buffers, paths,
+ * and the whole printf-family
+ */
 
 void   perror(FAR const char *s);
 int    printf(FAR const IPTR char *fmt, ...);