Based on user's feedback.

Ctrl+Shift+Space should show both docs for variable and contents

Sample code:

        class DemoClass {
            function demoFunction() {
                return;
            }
        }
        $var = new DemoClass;
        $var->demoFunction();

When "->" is typed, auto code completion works fine, suggesting
demoFunction();  It's great.

After that, user might want to see the definition of the
contents of the variable.  But, Ctrl+Shift+Space just shows
documentation of the variable itself only.  As the IDE already
recognizes variable contents (auto code completion works fine),
it is also better to be able to show the documentation of the contents.