doc: add and, or, not, is, is not operators

doc/sample/Person.im

@@ -409,8 +409,11 @@ cout put:'Hello, world!' unless x <= 10.
     execution.
 
     - unary operators
-        - boolean NOT (!)
+        - boolean NOT (not)
         - bitwise NOT (~)
+    - binary operators
+        - Type check operator (is, is not)
+        - Protocol check operator (understands)
     - unary messages, complex messages
     - binary operators
         - multiplication (*)
@@ -423,8 +426,8 @@ cout put:'Hello, world!' unless x <= 10.
         - bitwise AND (&)
         - bitwise XOR (^)
         - bitwise OR (|)
-        - boolean AND (&&)
-        - boolean OR (||)
+        - boolean AND (and)
+        - boolean OR (or)
         - cascade (;)
     - inline if-else
     - keyword messages
@@ -538,6 +541,12 @@ p1 = do
     x
 end.
 
+
+v = 'Hello'.
+if v is String then
+    cout put:'v is a string!'
+end
+
 /******************************************************************************/
 
 /**