chore: add description text to env example

Author: shakkernerd

.env.example

@@ -71,7 +71,7 @@ TWITTER_PASSWORD= # Account password
 TWITTER_EMAIL=    # Account email
 TWITTER_2FA_SECRET=
 
-# Authentication cookies for Twitter session
+# Authentication cookies for Twitter session (this is for login using cookies and is optional)
 TWITTER_COOKIES_AUTH_TOKEN=
 TWITTER_COOKIES_CT0=
 TWITTER_COOKIES_GUEST_ID=