Update README.md

Author: SamuelTallet

docs/README.md

@@ -18,9 +18,7 @@ Installation
 Configuration
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-Open *config.php* file located at project's root directory. Edit following constants values:
-
-`MPG_MONGODB_USER`, `MPG_MONGODB_PASSWORD`, `MPG_MONGODB_HOST` and `MPG_MONGODB_PORT`.
+Open *config.php* file located at project's root directory. Edit `MPG_MONGODB*` constants.
 
 Thanks
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