Document wxStreamBuffer::BufMode enum and fix dtor.

Document the enum as it's used as parameter type by other methods and so needs
to be declared to make the header parsable.

Also fix wxStreamBuffer dtor documentation which was missing a tilde.

Closes #14174.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@71080 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/stream.h

@@ -150,6 +150,13 @@ protected:
 class wxStreamBuffer
 {
 public:
+    /** BufMode flags */
+    enum BufMode
+    {
+        read,
+        write,
+        read_write
+    };
 
     /**
         Constructor, creates a new stream buffer using @a stream as a parent stream
@@ -241,7 +248,7 @@ public:
         Destructor.
         It finalizes all IO calls and frees all internal buffers if necessary.
     */
-    wxStreamBuffer();
+    ~wxStreamBuffer();
 
     /**
         Fill the IO buffer.