fix: add arrow head on example of alb-ec2

doc/links.md

@@ -8,27 +8,37 @@ The start and end points of the line specify the location as the 16-wind rose of
 
 ![position](static/position.png)
 
+```
+Diagrams:
+  Resources:
+    ALB: ...
+    PublicSubnet1Instance: ...
+    PublicSubnet2Instance: ...
+  Links:
+    - Source: ALB # (required)
+      SourcePosition: NNW # (required)
+      Target: PublicSubnet1Instance # (required)
+      TargetPosition: S # (required)
+    - Source: ALB # (required)
+      SourcePosition: NNE # (required)
+      Target: PublicSubnet2Instance # (required)
+      TargetPosition: S # (required)
+```
+
 ### Arrow head
 
 Arrows add context and meaning to a diagram by indicating the direction of flow.
 
 ![arrow head](static/arrows.png)
 (generated from [static/arrows.yaml](static/arrows.yaml))
 
-### Example
 ```
-Diagrams:
-  Resources:
-    ALB: ...
-    PublicSubnet1Instance: ...
-    PublicSubnet2Instance: ...
-  Links:
     - Source: ALB
       SourcePosition: NNW
-      Target: PublicSubnet1Instance
-      TargetPosition: S
-    - Source: ALB
-      SourcePosition: NNE
-      Target: PublicSubnet2Instance
-      TargetPosition: S
+      Target: VPCPublicSubnet1Instance
+      TargetPosition: SSE
+      TargetArrowHead: #(optional)
+        Type: Open #(required) Open/Default
+        Width: Default #  (optional) Narrow/Default/Wide default="Default"
+        Length: 2 # (optional) default=2
 ```