Remove CS1502 page and redirect to CS1503 page

.openpublishing.redirection.csharp.json

@@ -1826,6 +1826,10 @@
             "source_path_from_root": "/docs/csharp/misc/cs1007.md",
             "redirect_url": "/dotnet/csharp/language-reference/compiler-messages/overload-resolution"
         },
+        {
+            "source_path_from_root": "/docs/csharp/language-reference/compiler-messages/cs1502.md",
+            "redirect_url": "/dotnet/csharp/misc/cs1503.md"
+        },
         {
             "source_path_from_root": "/docs/csharp/misc/cs1510.md",
             "redirect_url": "/dotnet/csharp/language-reference/compiler-messages/ref-modifiers-errors"

docs/csharp/language-reference/toc.yml

@@ -1471,7 +1471,7 @@ items:
     - name: CS1113
       href: ../misc/cs1113.md
     - name: CS1502
-      href: ./compiler-messages/cs1502.md
+      href: ../misc/cs1503.md
     - name: CS1503
       href: ../misc/cs1503.md
     - name: CS1504

docs/csharp/misc/cs1503.md

@@ -4,12 +4,35 @@ title: "Compiler Error CS1503"
 ms.date: 07/20/2015
 f1_keywords: 
   - "CS1503"
+  - "CS1502"
 helpviewer_keywords: 
   - "CS1503"
+  - "CS1502"
 ms.assetid: 65e4c63d-928d-49f5-8fac-8e113b07e128
 ---
 # Compiler Error CS1503
 
-Argument 'number' cannot convert from TypeA to TypeB  
-
- The type of one argument in a method does not match the type that was passed when the class was instantiated. This error typically appears along with CS1502. See [CS1502](../language-reference/compiler-messages/cs1502.md) for a discussion of how to resolve this error.
+Argument 'argument' cannot convert from TypeA to TypeB
+
+The type of one argument in a method does not match the type that was passed when the class was instantiated.
+
+The following sample generates CS1503:
+
+```csharp
+namespace x
+{
+  public class a
+  {
+    public a(char i)
+    // try the following constructor instead
+    // public a(int i)
+    {
+    }
+
+    public static void Main()
+    {
+      a aa = new a(2222);   // CS1503
+    }
+  }
+}
+```