README updates

examples/rubyish/README.md

@@ -16,14 +16,14 @@ Features:
 - interpolating strings: "number #{37+5}" %Q{Hello #{planet}!}
 - quoted words: `%w[aa bb cc]` 
 - scoping, including $globals, @class_instance and @@package variables
-- conditional blocks: if ... then ... elsif ... else ... endif
+- conditional blocks: `if ... then ... elsif ... else ... endif`
 - begin .. end blocks
-- nqp opcode calls
-- a few built-ins: abort, print, puts, sleep
-- infixish assigments: += -= *= ...
+- nqp opcode calls: `nqp::sleep(5)`
+- a few built-ins: `abort`, `print`, `puts`, `sleep`
+- infixish assigments: `+=` `-=` `*=` ...
 - very simple classes and objects with attributes. no inheritence yet
-- while and until loops
-- statement modifiers `if` `unless`, `while`,  `until` e.g.: `puts 42 if `
+- `while` and `until` loops
+- statement modifiers `if` `unless`, `while`, `until` e.g.: `puts 42 if true`
 - basic arrays and hashes
 - for loops on arrays: `for val in [10,20,30] do puts val end`
 - for loops on hash keys: `h = {'a'=>10, 'b'=>20}; for k in h do puts h{k} end`
@@ -47,7 +47,7 @@ Expressions are Perlish rather than Rubyish:
 - `~` has been introduced as the concatenation operator
 - `>`, `==`, `<=` ... only do arithmetic comparisons
 - `gt`, `eq`, `le` ... do string comparisions
-- 0, '0', ''  are false in a boolean context.
+- 0, '0', '', nil  are false in a boolean context.
 - hash dereferencing is via angle braces: `price = fruit<apples>` or
 curly brackets `puts fruit{'bannanas'}`