Fix diffrent naming in getting_started.md

[greenbigfrog]

I've noticed that once <h1>Editing article</h1> L1157 was the title and then later on it's <h1>Edit article</h1> L1358 which kind of makes more sense...

[ci skip]

[rails-bot]

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[prathamesh-sonpatki]

Thanks! Good catch @greenbigfrog!

[greenbigfrog]

No Problem!