Improve formatting for enum configuration values

- Improve readability of enum configuration value formatting by switching to a bullet list style in documentation generation.

Author: gastaldi

devtools/config-doc-maven-plugin/src/main/java/io/quarkus/maven/config/doc/generator/AbstractFormatter.java

@@ -83,7 +83,7 @@ public String formatTypeDescription(ConfigProperty configProperty, Context conte
             } else {
                 typeContent = configProperty.getEnumAcceptedValues().values().values().stream()
                         .map(v -> v.configValue())
-                        .collect(Collectors.joining("`, `", "`", "`"));
+                        .collect(Collectors.joining("` \n - `", "- `", "`"));
             }
         } else {
             typeContent = configProperty.getTypeDescription();