doc: add lambdas to sample file

doc/sample/Expressions.im

@@ -108,15 +108,27 @@ class Person
             #days   => self::age / 365,
             _       => 0
         end!
-		
+
-	$ exampleProperty | get => self::val, set => self::val = value.
+    $ exampleProperty | get => self::val, set => self::val = value.
 
     $ exampleProperty2 |
-        get => self::val.
+        get => [ ^self::val ],
+        set => [ :x | self::val = x ].
 
     $ exampleProperty3 | get => 42.
 
     $ exampleProperty4 (get, set)
 
     $ exampleProperty5 (get)
-end
+end
+
+j = [ cout put:'Hello!' ].
+k = [ :x :y | cout put:'Hello, {x}, {y}!' ].
+
+x > 2
+    if:[ cout put:'True' ]
+    else:[ cout put: 'False' ].
+
+0 to:100 step:2 do:[ :i | cout put:'Count: {i}' ].
+
+p1 test(param:'Hello' :'World').