docs: add KDL v2 example files

Author: tassis

examples/16-kdl-v2-literals.kdl

@@ -0,0 +1,7 @@
+// KDL v2-style booleans, null, and keyword-like numbers.
+
+enabled #true
+disabled #false
+empty #null
+
+limits #inf #-inf #nan

examples/17-kdl-v2-strings.kdl

@@ -0,0 +1,16 @@
+// KDL v2-style multiline and raw string forms.
+
+( "tag" ) "quoted node" key = #true
+
+raw-string #"hello, world"#
+
+multi-line """
+hello
+world
+"""
+
+raw-multi-line #"""
+raw
+multiline
+string
+"""#