Update document-ready.md

[riverma]

$( window ).load(function () {}) deprecated since v1.8. Should use $( window ).on("load", function () {}) https://github.com/jquery/jquery/issues/2286

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[AurelioDeRosa]

Can you sign the CLA and also add a space before and after the "load" string to conform to our code style guide?

[AurelioDeRosa]

Hi @riverma. Can you sign our CLA?