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Update getting_started.md

It's not very clear exactly what the "params" method is and does, as the current description in the guide is somewhat vague and brief. An example is helpful, especially considering this method is referenced over 30 times in this guide. [ci skip]
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1 parent 4316f2a commit d99172e450edba77df0990ba758a2a8396f3a4f6 @jonathancadepowers jonathancadepowers committed Jun 5, 2014
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  1. +2 −0 guides/source/getting_started.md
@@ -623,6 +623,8 @@ method returns an `ActiveSupport::HashWithIndifferentAccess` object, which
allows you to access the keys of the hash using either strings or symbols. In
this situation, the only parameters that matter are the ones from the form.
+TIP: Ensure you have a firm grasp of the `params` method, as you'll use it fairly regularly. Let's consider an example URL: **http://www.example.com/?username=dhh&email=dhh@email.com**. In this URL, `params[:username]` would equal "dhh" and `params[:email]` would equal "dhh@email.com".
+
If you re-submit the form one more time you'll now no longer get the missing
template error. Instead, you'll see something that looks like the following:

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