More documentation on chained assignment.

src/lib.rs

@@ -80,7 +80,7 @@ pub use error::{ParseError, ParseErrorType};
 pub use fn_register::{RegisterDynamicFn, RegisterFn, RegisterResultFn};
 pub use parser::{Position, AST, FLOAT, INT};
 pub use result::EvalAltResult;
-pub use scope::Scope;
+pub use scope::{Scope, ScopeEntry, VariableType};
 
 #[cfg(not(feature = "no_index"))]
 pub use engine::Array;