* Update Portals Documentation
Correct some grammar to be more explicit and clear. Update example CodePen to better match code found in documentation. Update code example styles to match other code examples (ie. 'State and Lifecycle', 'Handling Events').
* Clean up comment to be accurate to example
There was a small comment overlooked when reviewing the documentation. This fixes it to be accurate to the example as well as grammatically correct.
* Update portals.md
* More fixes
Dan Abramov
Andrew Clark
Samuel
Kaylee Knowles