Update enforce-engine.md

Author: itzmk21

docs/enforce-engine.md

@@ -11,7 +11,7 @@ will be created anyway using the enforced engine (this is consistent with the
 default *MySQL* way of creating the default storage engine if other engines
 are not available unless `NO_ENGINE_SUBSTITUTION` is set).
 
-In case user tries to enable [enforce_storage_engine](#enforce_storage_engine) with engine that isn’t available, system will not start.
+In case a user tries to enable [enforce_storage_engine](#enforce_storage_engine) with an engine that isn’t available, the system will not start.
 
 !!! note