Use Correct Meta-Annotation in Kotlin Sample

Author: tahakorkem

docs/modules/ROOT/pages/servlet/authorization/method-security.adoc

@@ -955,7 +955,7 @@ Kotlin::
 @Target(ElementType.METHOD, ElementType.TYPE)
 @Retention(RetentionPolicy.RUNTIME)
 @PreAuthorize("hasRole('{value}')")
-annotation class IsAdmin(val value: String)
+annotation class HasRole(val value: String)
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