ffprobe: fix typo in a comment

ffprobe.c

@@ -74,7 +74,7 @@ static char *stream_specifier;
 /* section structure definition */
 
 struct section {
-    int id;             ///< unique id indentifying a section
+    int id;             ///< unique id identifying a section
     const char *name;
 
 #define SECTION_FLAG_IS_WRAPPER      1 ///< the section only contains other sections, but has no data at its own level