Fix double 'the' typo in planning-application.md

I just saw the typo while I was translating the guides and thought I'd change it. Also, five of these list items use the word 'provide' and the explicit subject 'it' comes across as repetitive, which makes the whole thing hard to understand, though that's another issue.
Merge pull request #945 from ulisesrmzroche/patch-1

Fix double 'the' typo in planning-application.md