[docs] Update CHANGELOG.md (#14516)

CHANGELOG.md

@@ -3,7 +3,7 @@
 ## 4.0.0-alpha.0
 ###### *Feb 12, 2019*
 
-This is our first unstable release towards Material-UI v4.0.0. We try to release a major every 6-12 months.
+This is our first unstable release toward Material-UI v4.0.0. We try to release a major every 6-12 months.
 This gives us the opportunity to remove deprecated APIs, upgrade our peer dependencies and more importantly, keep up with the direction the community is taking.
 
 - You can find the documentation following this URL: https://next.material-ui.com/.
@@ -77,8 +77,8 @@ console.log({ background });
 Remove the deprecated button flat, raised and fab variants:
 
 ```diff
--<Button variant="contained" />
-+<Button variant="raised" />
+-<Button variant="raised" />
++<Button variant="contained" />
 ```
 
 ```diff