docs: demonstrate using symbolic arrays in @mtkmodel

docs/src/basics/MTKModel_Connector.md

@@ -37,8 +37,8 @@ using ModelingToolkit
 
 @mtkmodel ModelA begin
     @parameters begin
-        k1
-        k2
+        k
+        k_array[1:2]
     end
 end
 
@@ -61,10 +61,10 @@ end
     end
     @extend ModelB(; p1)
     @components begin
-        model_a = ModelA(; k1)
+        model_a = ModelA(; k_array)
     end
     @equations begin
-        model_a.k1 ~ f(v)
+        model_a.k ~ f(v)
     end
 end
 ```
@@ -78,9 +78,9 @@ end
   - Whenever a parameter or variable has initial value, for example `v(t) = 0.0`, a symbolic variable named `v` with initial value 0.0 and a keyword argument `v`, with default value `nothing` are created. <br> This way, users can optionally pass new value of `v` while creating a component.
 
 ```julia
-julia > @named model_c = ModelC(; v = 2.0);
+julia> @mtkbuild model_c1 = ModelC(; v = 2.0);
 
-julia > ModelingToolkit.getdefault(model_c.v)
+julia> ModelingToolkit.getdefault(model_c.v)
 2.0
 ```
 
@@ -96,7 +96,7 @@ julia > ModelingToolkit.getdefault(model_c.v)
   - Note that in above example, `p1` is promoted as an argument of `ModelC`. Users can set the value of `p1`. However, as `p2` isn't listed in the model definition, its initial guess can't be specified while creating an instance of `ModelC`.
 
 ```julia
-julia> @named model_c = ModelC(; p1 = 2.0)
+julia> @mtkbuild model_c2 = ModelC(; p1 = 2.0)
 
 ```
 
@@ -105,14 +105,25 @@ julia> @named model_c = ModelC(; p1 = 2.0)
   - Declare the subcomponents within `@components` begin block.
   - The arguments in these subcomponents are promoted as keyword arguments as `subcomponent_name__argname` with `nothing` as default value.
   - Whenever components are created with `@named` macro, these can be accessed with `.` operator as `subcomponent_name.argname`
-  - In the above example, `k1` of `model_a` can be set in following ways:
+  - In the above example, as `k` of `model_a` isn't listed while defining the sub-component in `ModelC`, its default value can't be modified by users. While `k_array` can be set as:
 
-```julia
-julia> @named model_c1 = ModelC(; model_a.k1 = 1);
+```@example mtkmodel-example
+using ModelingToolkit: getdefault
 
-```
+@mtkbuild model_c3 = ModelC(; model_a.k_array = [1.0, 2.0])
 
-And as `k2` isn't listed in the sub-component definition of `ModelC`, its default value can't be modified by users.
+getdefault(model_c3.model_a.k_array[1])
+# 1.0
+getdefault(model_c3.model_a.k_array[2])
+# 2.0
+
+@mtkbuild model_c4 = ModelC(model_a.k_array = 3.0)
+
+getdefault(model_c4.model_a.k_array[1])
+# 3.0
+getdefault(model_c4.model_a.k_array[2])
+# 3.0
+```
 
 #### `@equations` begin block