Apply suggestions from code review

Co-authored-by: Nils Adermann <naderman@naderman.de>

doc/articles/plugins.md

@@ -34,7 +34,7 @@ requirements:
    it only specifies which version of the plugin API to use.
 
 > **Note:** When developing a plugin, although not required, it's useful to add
-> a dev-dependency to `composer/composer` to have IDE auto completion on Composer classes.
+> a require-dev dependency on `composer/composer` to have IDE auto completion on Composer classes.
 
 The required version of the `composer-plugin-api` follows the same [rules][7]
 as a normal package's.
@@ -42,7 +42,7 @@ as a normal package's.
 The current Composer plugin API version is 1.1.0.
 
 An example of a valid plugin `composer.json` file (with the autoloading
-part omitted and an optional dev-dependency of `composer/composer` for IDE auto completion):
+part omitted and an optional require-dev dependency on `composer/composer` for IDE auto completion):
 
 ```json
 {