Improve documentation for var properties
Previously, the initialization value assignment semantics of var
properties wasn't explicitly documented. Since curly braces on the
RHS of an initialization assignment denotes a binding (and curly
braces have a different meaning in JavaScript) confusion could result.
This commit clearly explains how to initialize a var property with an
empty object value.
Task-number: QTBUG-23734
Task-number: QTBUG-23388
Change-Id: Ifa94846b170919a0c893f7dda1421c9fb24bd0db
Reviewed-by: Michael Brasser <michael.brasser@nokia.com>