doc: sample: make the simple sample script actually simple

doc/sample/simple.bshell

@@ -1,22 +1,3 @@
-func test-function($name) {
-    if (5 -lt $var) {
-        echo good
-    } else {
-        echo bad
-    }
+$name = "Jonh"
 
-    echo "Hello, $name! $(2 + 4 + 2) wow"
-}
-
-# Example of instantiating an FX runtime object.
-$obj = new-object -type-name fx.string -arguments "John Doe"
-
-$hash = @{
-    1       = 'one'
-    2       = 'two'
-    'three' = 3
-}
-
-$hash2 = @{ 1 = 'one'; 2 = 'two'; 'three' = 3 }
-
-test-function -name $obj
+echo "Hello, $name!"