mono-docs: Filter out some more unwanted constructors

These should not be used by users, so take them out of the DocFX docs.

doc/docfx/filterConfig.yml

@@ -3,6 +3,12 @@ apiRules:
     uidRegex: ^.*NativeMethods$
 - exclude:
     uidRegex: ^.*NativeStruct$
+- exclude:
+    uidRegex: ^.*ConstructingHandle.*$
+- exclude:
+    uidRegex: ^.*WrappingHandle.*$
+- exclude:
+    uidRegex: ^.*#ctor\(IntPtr.*$
 - exclude:
     uidRegex: ^.*Concrete$
 - include: