Fixing tabs/spaces as per feedback received & some other minor changes

Fixing tabs/spaces as per feedback received & some other minor changes

```
Hi,
In case you still want feedback, when I open the tutorial in vanilla Chrome, the boxes with the examples wrap badly.  It looks as if a tab stop is too far to the right. It doesn't affect all the boxes equally -- the one about Constants is mostly OK.
In other feedback, that's exactly the level of tutorial I find helpful, so thanks for writing it!
```
This commit is contained in:
Jigyasa Grover 2019-01-04 07:59:16 -08:00 committed by GitHub
parent d08c4a7f79
commit 57524943c8
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