Update notification for release 0.43

Based on @pthiess's original draft plus the [release notes](https://github.com/adobe/brackets/wiki/Release-Notes:-0.43) draft.

CC @ryanstewart @dangoor @njx in case you have feedback.

Also -- added README instructions for testing JSON changes like these in-situ in Brackets.
That's true of the question but the response was:
```text
A. Yes, some types of writing require that punctuation be placed outside the quoted material (please see CMOS 7.50, 7.75). And in any case, Chicago editors are quick to abandon a rule if it renders writing useless or incorrect. It is usually acceptable to do the sensible thing.
```
I thought the second part applied to this example because it rendered the written example incorrect.  the UI doesn't have a period.

You could also remove the quotes or using formatting such as `e.g. <b>7 of 32</b>.` instead and there wouldn't be an issue :)