Not obvious flask defaults to using port 5000

[straticsryan]

File: compose/gettingstarted.md, CC @londoncalling

I was a bit confused when I encountered port 5000 in step 3. I kept looking back to understand why we were referencing port 5000 and where it was "exposed". Didn't realize flask defaulted to port 5000.

Suggested fix to add a note in step 1 that flask defaults to port 5000 like you noted for redis?

[londoncalling]

@straticsryan thanks, good point. I'm going to include this fix on a pull request I'm already working on for some other Compose examples. I'll tag you on it when it's closer to being ready.

[docker-robott]

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