[Templating] Added a sentence that explains what a Template Helper is #4344
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I found a SecurityHelper in the SecurityBundle. I was unsure what this helper was or what it was supposed to do. After some googling I've landed on the templating component documation. This is correct as the
HelperInterface
can be found in the component. However, it doesn't explain what a helper is.After some searching, the cookbook does explain what a helper is. I've pretty much copied over the sentence from the cookbook to the component. If you have a better proposal, I can add that instead.