Fix checkstyle violation.

proxy/src/main/java/com/velocitypowered/proxy/command/builtin/ShutdownCommand.java

@@ -60,7 +60,7 @@ public final class ShutdownCommand {
                 try {
                   reasonComponent = GsonComponentSerializer.gson()
                       .deserializeOrNull(reason);
-                } catch (JsonSyntaxException ignored) {
+                } catch (JsonSyntaxException expected) {
 
                 }
               }