Fix spelling in development-guide.md

Author: skovhus

docs/development-guide.md

@@ -67,8 +67,8 @@ published the client lives in a separate repository.
 
 ## Working on the server
 
-The easiest way right now is to simple compile and install the server globally
-whenever you've made a change, and then reload you vscode window to re-launch
+The easiest way right now is to simply compile and install the server globally
+whenever you've made a change, and then reload your vscode window to re-launch
 the server.
 
 ```
@@ -84,4 +84,4 @@ I'm open to suggestions on how to improve this workflow.
 [prettier]: https://prettier.io/
 [tslint]: https://palantir.github.io/tslint/
 [yarn]: https://yarnpkg.com/lang/en/docs/install/
-[node]: https://nodejs.org/en/download/
+[node]: https://nodejs.org/en/download/