Fix link in ogg_stream_clear documentation.

The link pointed to the wrong structure documentation.
Looks like a cut-and-paste error.

doc/libogg/ogg_stream_clear.html

@@ -17,7 +17,7 @@ <h1>ogg_stream_clear</h1>
 
 <p><i>declared in "ogg/ogg.h";</i></p>
 
-<p>This function clears and frees the internal memory used by the <a href="ogg_sync_state.html">ogg_stream_state</a> struct, but does not free the structure itself. It is safe to call ogg_stream_clear on the same structure more than once.
+<p>This function clears and frees the internal memory used by the <a href="ogg_stream_state.html">ogg_stream_state</a> struct, but does not free the structure itself. It is safe to call ogg_stream_clear on the same structure more than once.
 <br><br>
 <table border=0 color=black cellspacing=0 cellpadding=7>
 <tr bgcolor=#cccccc>