Change DB_HOST value in .env.example

Updated DB_HOST placeholder for clarity.

Author: WizardLoop

src/.env.example

@@ -4,7 +4,7 @@ BOT_TOKEN=your_bot_token
 ADMIN=your_username_or_id # [can be multiple admins just add: , ex: 1234, 12345]
 BOT_NAME=GetAnyMessage
 DB_FLAG=yes # can be set no or null
-DB_HOST=localhost # can be null if DB_FLAG=no
+DB_HOST=your-db-host # can be null if DB_FLAG=no
 DB_PORT=3306 # can be null if DB_FLAG=no
 DB_USER=mpuser # can be null if DB_FLAG=no
 DB_PASS=mp_pass # can be null if DB_FLAG=no