fix: correctly remove self link when it is false (#648)

Author: saddamshahzadnxb

docs/basics/schemas.md

@@ -392,9 +392,9 @@ class Schema extends SchemaProvider
 {
     // ...
 
-    public function getResourceLinks($resource): ?array
+    public function getResourceLinks($resource): iterable
     {
-        return null;
+        return ['self' => false];
     }
 }
 ```

src/Schema/Schema.php

@@ -123,6 +123,10 @@ public function getLinks($resource): iterable
             $links[LinkInterface::SELF] = $this->getSelfLink($resource);
         }
 
+        if ($self === false) {
+            unset($links[LinkInterface::SELF]);
+        }
+
         return $links;
     }