GRAILS-8821 - docs for first() and last() methods

src/en/ref/Domain Classes/first.gdoc

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+h1. first
+
+h2. Purpose
+
+Retrieves the first instance of the domain class.
+
+h2. Examples
+
+Given the domain class:
+
+{code:java}
+class Person {
+    String firstName
+    String lastName
+    Integer age
+}
+{code}
+
+{code:java}
+// retrieve the first person ordered by the identifier
+def p = Person.first()
+
+// retrieve the first person ordered by the lastName property
+p = Person.first(sort: 'lastName')
+{code}
+
+Parameters:
+
+* @sort@ (optional) - The name of the property to sort by
+
+See also:
+
+* [last|domainClasses]
+

src/en/ref/Domain Classes/last.gdoc

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+h1. last
+
+h2. Purpose
+
+Retrieves the last instance of the domain class.
+
+h2. Examples
+
+Given the domain class:
+
+{code:java}
+class Person {
+    String firstName
+    String lastName
+    Integer age
+}
+{code}
+
+{code:java}
+// retrieve the last person ordered by the identifier
+def p = Person.last()
+
+// retrieve the last person ordered by the lastName property
+p = Person.last(sort: 'lastName')
+{code}
+
+Parameters:
+
+* @sort@ (optional) - The name of the property to sort by
+
+See also:
+
+* [first|domainClasses]
+
+