docs: update comment

Author: kenjis

user_guide_src/source/general/errors/012.php

@@ -10,6 +10,6 @@ class Exceptions extends BaseConfig
     // ...
     public bool $logDeprecations = true; // If set to false, an exception will be thrown.
     // ...
-    public string $deprecationLogLevel = LogLevel::WARNING; // this should be one of the log levels supported by PSR-3
+    public string $deprecationLogLevel = LogLevel::WARNING; // This should be one of the log levels supported by PSR-3.
     // ...
 }