- completed section on built-in functions
- moved Conversions section out of built-in functions and into expressions
- fixed syntax of conversions (parens are not mandatory if the type is not a TypeName)
(this is the only change to the Conversions section; the rest of the text is just moved;
old line: 4043, new line: 3078)
- fixed syntax of composite literals (parens are allowed around LiteralType)