Fix code compile (#3344)

Author: lindexi

xml/System.Diagnostics/ProcessStartInfo.xml

@@ -244,7 +244,7 @@
 `ArgumentList` is easier to use than the <xref:System.Diagnostics.ProcessStartInfo.Arguments> property. Because each string is assigned to a member of the collection, you can single- rather than triple-escape strings that are delimited by quotation marks. For example, the following example include `-full "Mary Smith"` as a member of the `ArgumentList` collection:
 
 ```csharp
-info.ArgumentList.Add("-full \"Mary Smith\"";
+info.ArgumentList.Add("-full \"Mary Smith\"");
 ```
 
 The corresponding assignment to the <xref:System.Diagnostics.ProcessStartInfo.Arguments> property is: