use standard tags @class,,@lib,@category for wxScopeGuard, too (to keep the documentation style uniform)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@56196 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/scopeguard.h

@@ -7,9 +7,14 @@
 /////////////////////////////////////////////////////////////////////////////
 
 /**
+    @class wxScopeGuard
+
     Scope guard is an object which allows executing an action on scope exit.
 
     The objects of this class must be constructed using wxMakeGuard() function.
+
+    @nolibrary
+    @category{misc}
  */
 class wxScopeGuard
 {