Update widget page to describe correct getter function

[thcipriani]

Previously page described use of option method as:

var bar = $( "<div />")
    .appendTo( "body" )
    .progressbar()
    .data( "progressbar" );

bar.option( "value"); // Setter

This correction describes the usage of the option method as:

var bar = $( "<div />")
    .appendTo( "body" )
    .progressbar()
    .data( "progressbar" );

bar.option( "value"); // Getter

[scottgonzalez]

Thanks, can you please sign our CLA?

[thcipriani]

@scottgonzalez 👍

[scottgonzalez]

Thanks. It's being deployed right now.