Update npm.md

pages/common/npm.md

@@ -11,11 +11,11 @@
 
 `npm install`
 
-- Download a given dependency, and add it to the package.json (as `dependencies`):
+- Download a given dependency required for the application to run, and add it to the package.json:
 
 `npm install {{module_name}}@{{version}} --save`
 
-- Download a given dependency, and add it to the package.json (as `devDependencies`):
+- Download a given dependency for development purposes, and add it to the package.json:
 
 `npm install {{module_name}}@{{version}} --save-dev`