docs(config): string types

Author: brandyscarney

core/src/utils/config.ts

@@ -224,9 +224,9 @@ export interface IonicConfig {
   /**
    * Configures the logging level for Ionic Framework:
    *
-   * - `OFF`: No errors or warnings are logged.
-   * - `WARN`: Logs errors and warnings.
-   * - `ERROR`: Logs only errors.
+   * - `'OFF'`: No errors or warnings are logged.
+   * - `'WARN'`: Logs errors and warnings.
+   * - `'ERROR'`: Logs only errors.
    */
   logLevel?: LogLevel;