refactor(#664): fix doc

cli/src/main/java/dev/fitko/fitconnect/cli/keygen/JWKGenerator.java

@@ -34,7 +34,7 @@ import java.util.UUID;
 /**
  * JWK Test Key Generator.
  * <p>
- * Generates public and private keys for encryption and signing with.
+ * Generates key pairs of public and private keys for encryption and signing.
  */
 public class JWKGenerator {
 

cli/src/main/java/dev/fitko/fitconnect/cli/keygen/KeyWriter.java

@@ -99,7 +99,7 @@ public final class KeyWriter {
             Files.write(path, content.getBytes(StandardCharsets.UTF_8));
         } catch (final IOException e) {
             LOGGER.error(e.getMessage(), e);
-            throw new RuntimeException(e);
+            System.exit(0);
         }
     }
 }