Create Complex Params Docs (#2160)

* create complex params docs

* Update docs/guides/int_framework/intro.md

Co-authored-by: Quin Lynch <49576606+quinchs@users.noreply.github.com>

docs/guides/int_framework/samples/intro/complexparams.cs

@@ -0,0 +1,37 @@
+public class Vector3
+{
+    public int X {get;}
+    public int Y {get;}
+    public int Z {get;}
+
+    public Vector3()
+    {
+        X = 0;
+        Y = 0;
+        Z = 0;
+    }
+
+    [ComplexParameterCtor]
+    public Vector3(int x, int y, int z)
+    {
+        X = x;
+        Y = y;
+        Z = z;
+    }
+}
+
+// Both of the commands below are displayed to the users identically.
+
+// With complex parameter
+[SlashCommand("create-vector", "Create a 3D vector.")]
+public async Task CreateVector([ComplexParameter]Vector3 vector3)
+{
+    ...
+}
+
+// Without complex parameter
+[SlashCommand("create-vector", "Create a 3D vector.")]
+public async Task CreateVector(int x, int y, int z)
+{
+    ...
+}