Translated "State: A Component's Memory" page (reactjs#671)

* Translated "State: A Component's Memory" page

* Fix typo

* Update src/content/learn/state-a-components-memory.md

Co-authored-by: Felipe Freitag Vargas <[email protected]>

* Update src/content/learn/state-a-components-memory.md

Co-authored-by: Felipe Freitag Vargas <[email protected]>

* Update src/content/learn/state-a-components-memory.md

Co-authored-by: Felipe Freitag Vargas <[email protected]>

* Update src/content/learn/state-a-components-memory.md

Co-authored-by: Felipe Freitag Vargas <[email protected]>

* docs(pt-br): fix typos on <Intro>

* docs(pt-br): changed writing on <YouWillLearn> section

* docs(pt-br): general improvements to the translation

* docs(pt-br): fix hyphenization in 're-render'

Co-authored-by: Wesley Tuschi <[email protected]>

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Co-authored-by: Felipe Freitag Vargas <[email protected]>
Co-authored-by: Wesley Tuschi <[email protected]>