Remove reference to nonexistent method in C# API (#3631)

* Remove reference to nonexistent method in C# API

The mentioned method overload of File.Move() doesn't actually exist in the C# version of this API.

I have removed the reference to it and briefly described an alternative option.

* Explain difference in .NET Core 3 and .NET Framework

Co-Authored-By: Carlos Sanchez Lopez <[email protected]>

Author: maillouxc

xml/System.IO/File.xml

@@ -2422,7 +2422,11 @@
 
 This method works across disk volumes, and it does not throw an exception if the source and destination are the same.
 
-Note that if you attempt to replace a file by moving a file of the same name into that directory, an <xref:System.IO.IOException> is thrown. For that purpose, call <xref:System.IO.File.Move(System.String,System.String,System.Boolean)> instead.
+Note that if you attempt to replace a file by moving a file of the same name into that directory, an <xref:System.IO.IOException> is thrown. To avoid this problem:
+
+- In .NET Core 3.0 and later versions, you can call <xref:System.IO.File.Move(System.String,System.String,System.Boolean)> setting the parameter `overwrite` to `true`, which will replace the file if it exists.
+
+- In all .NET versions, you can call <xref:System.IO.File.Delete(System.String)> before calling `Move`, which will only delete the file if it exists.
 
 The `sourceFileName` and `destFileName` arguments can include relative or absolute path information. Relative path information is interpreted as relative to the current working directory. To obtain the current working directory, see <xref:System.IO.Directory.GetCurrentDirectory%2A>.