Fix spelling error

Line 23, 
2.0 sction below => 2.0 section below

README.md

@@ -20,7 +20,7 @@ Check out [polymer-project.org](https://www.polymer-project.org) for all of the
 Or if you'd just like to download the library, check out our [releases page](https://github.com/polymer/polymer/releases).
 
 ## Polymer 2.0 now at Release Candidate!
-Polymer 2.0 is now at Release Candidate stage, and will be the future focus of Polymer development going forward.  We intend to keep the 2.x public API stable barring critical feedback or issues during the release candidate period.  For background and migration information on the 2.x see the [2.0 documentation](https://www.polymer-project.org/2.0/docs/about_20) on the website or the [2.0 sction below](#release-candidate), and we welcome your feedback via [issues](https://github.com/Polymer/polymer/issues/new) or [Slack](https://polymer-slack.herokuapp.com/).
+Polymer 2.0 is now at Release Candidate stage, and will be the future focus of Polymer development going forward.  We intend to keep the 2.x public API stable barring critical feedback or issues during the release candidate period.  For background and migration information on the 2.x see the [2.0 documentation](https://www.polymer-project.org/2.0/docs/about_20) on the website or the [2.0 section below](#release-candidate), and we welcome your feedback via [issues](https://github.com/Polymer/polymer/issues/new) or [Slack](https://polymer-slack.herokuapp.com/).
 
 **To evaluate Polymer 2.0**, please point your bower at the latest `2.0.0-rc.x` tag for polymer, and be sure load to the `webcomponentsjs/webcomponents-lite.js` or `webcomponentsjs/webcomponents-loader.js` polyfills from the latest `v1.0.0-rc.x` tag of [`webcomponentsjs`](https://github.com/webcomponents/webcomponentsjs)
 
@@ -516,4 +516,4 @@ id is to use `id`.
 
   ```html
   <img src$="[[importPath]]foo.jpg">
-  ```
+  ```