Doxygen: set TYPEDEF_HIDES_STRUCT.

This option tells doxygen to handle typedef struct foo_t foo_t by
making foo_t and struct foo_t synonymous. This lets doxygen find
documentation that it would otherwise miss: otherwise, if it sees
documentation for "int func(foo_t *)" and a prototype for
"int func(struct foo_t)", it will think that the prototype is
undocumented.

Part of #32386.

Doxyfile.in

@@ -435,7 +435,7 @@ INLINE_SIMPLE_STRUCTS  = NO
 # types are typedef'ed and only the typedef is referenced, never the tag name.
 # The default value is: NO.
 
-TYPEDEF_HIDES_STRUCT   = NO
+TYPEDEF_HIDES_STRUCT   = YES
 
 # The size of the symbol lookup cache can be set using LOOKUP_CACHE_SIZE. This
 # cache is used to resolve symbols given their name and scope. Since this can be