docs: specify a domain class name when securityConfigType is Requestmap (#1179)

Author: bkoehm

plugin-core/docs/src/docs/requestMappings/requestmapInstances.adoc

@@ -30,6 +30,47 @@ To use `Requestmap` entries, specify `securityConfigType="Requestmap"`:
 grails.plugin.springsecurity.securityConfigType = "Requestmap"
 ----
 
+A domain class must also be specified for the `Requestmap`:
+
+[source,groovy]
+.Listing {counter:listing}. Specifying `requestMap.className` with a domain class
+----
+grails.plugin.springsecurity.requestMap.className = "com.foo.bar.Requestmap"
+----
+
+An example `Requestmap` domain class:
+[source, groovy]
+.`Requestmap.groovy`
+----
+package com.foo.bar
+
+import org.springframework.http.HttpMethod
+
+import groovy.transform.EqualsAndHashCode
+import groovy.transform.ToString
+
+@EqualsAndHashCode(includes=['configAttribute', 'httpMethod', 'url'])
+@ToString(includes=['configAttribute', 'httpMethod', 'url'], cache=true, includeNames=true, includePackage=false)
+class Requestmap implements Serializable {
+
+	private static final long serialVersionUID = 1
+
+	String configAttribute
+	HttpMethod httpMethod
+	String url
+
+	static constraints = {
+		configAttribute nullable: false, blank: false
+		httpMethod nullable: true
+		url nullable: false, blank: false, unique: 'httpMethod'
+	}
+
+	static mapping = {
+		cache true
+	}
+}
+----
+
 You create `Requestmap` entries as you create entries in any Grails domain class:
 
 [source,groovy]