Fix article typo

remove unnecessary 'in'

Author: helloimjordan

1-js/01-getting-started/2-manuals-specifications/article.md

@@ -13,7 +13,7 @@ A new specification version is released every year. In-between these releases, t
 
 To read about new bleeding-edge features, including those that are "almost standard" (so-called "stage 3"), see proposals at <https://github.com/tc39/proposals>.
 
-Also, if you're in developing for the browser, then there are other specifications covered in the [second part](info:browser-environment) of the tutorial.
+Also, if you're developing for the browser, then there are other specifications covered in the [second part](info:browser-environment) of the tutorial.
 
 ## Manuals