revert Effect.Dispose being protected

Author: lonitra

xml/System.Drawing.Imaging.Effects/Effect.xml

@@ -47,12 +47,12 @@
       </Docs>
     </Member>
     <Member MemberName="Dispose">
-      <MemberSignature Language="C#" Value="protected virtual void Dispose (bool disposing);" />
-      <MemberSignature Language="ILAsm" Value=".method familyinstance hidebysig newslot virtual instance void Dispose(bool disposing) cil managed" />
+      <MemberSignature Language="C#" Value="public virtual void Dispose (bool disposing);" />
+      <MemberSignature Language="ILAsm" Value=".method public hidebysig newslot virtual instance void Dispose(bool disposing) cil managed" />
       <MemberSignature Language="DocId" Value="M:System.Drawing.Imaging.Effects.Effect.Dispose(System.Boolean)" />
-      <MemberSignature Language="VB.NET" Value="Protected Overridable Sub Dispose (disposing As Boolean)" />
+      <MemberSignature Language="VB.NET" Value="Public Overridable Sub Dispose (disposing As Boolean)" />
       <MemberSignature Language="F#" Value="abstract member Dispose : bool -&gt; unit&#xA;override this.Dispose : bool -&gt; unit" Usage="effect.Dispose disposing" />
-      <MemberSignature Language="C++ CLI" Value="protected:&#xA; virtual void Dispose(bool disposing);" />
+      <MemberSignature Language="C++ CLI" Value="public:&#xA; virtual void Dispose(bool disposing);" />
       <MemberType>Method</MemberType>
       <AssemblyInfo>
         <AssemblyName>System.Drawing.Common</AssemblyName>