docs: update api step 1 path in self hosting documentation (calcom#23393)

Author: grudra7714

docs/self-hosting/installation.mdx

@@ -94,7 +94,7 @@ We recommend using the admin UI/wizard instead of the seeder to enable app store
 Copy the .env files from their respective example files:
 
 ```
-cp apps/api/.env.example apps/api/V2/.env
+cp apps/api/v2/.env.example apps/api/v2/.env
 cp .env.example .env
 ```