Fix typo in documentation (#15798)

docs/developers-guide.md

@@ -59,7 +59,7 @@ If you plan to work on the Metabase code and make changes then you'll need to un
 
 ### Overview
 
-The Metabase application has two basic compnents:
+The Metabase application has two basic components:
 
 1. a backend written in Clojure which contains a REST API as well as all the relevant code for talking to databases and processing queries.
 2. a frontend written as a Javascript single-page application which provides the web UI.