Translations: Fix command typo in docs. (#2449)

## Motivation for the change, related issues
Closes: #2447

## Implementation details
- Updated the command to test the translations in local.

Author: vipul0425

packages/docs/site/docs/main/contributing/translations.md

@@ -67,7 +67,7 @@ To locally test an existing language, you can do:
 
 ```
 
-npm run dev:docs -- --locale es
+npm run dev -- --locale es
 
 ```