Add React 17 release date to versioning policy (#3428)

Author: danoc

content/docs/faq-versioning.md

@@ -22,7 +22,7 @@ Minor releases are the most common type of release.
 
 ### Breaking Changes {#breaking-changes}
 
-Breaking changes are inconvenient for everyone, so we try to minimize the number of major releases – for example, React 15 was released in April 2016 and React 16 was released in September 2017; React 17 isn't expected until sometime in 2020.
+Breaking changes are inconvenient for everyone, so we try to minimize the number of major releases – for example, React 15 was released in April 2016 and React 16 was released in September 2017, and React 17 was released in October 2020.
 
 Instead, we release new features in minor versions. That means that minor releases are often more interesting and compelling than majors, despite their unassuming name.