fix: use only ASCII characters

Author: paullatzelsperger

plugins/autodoc/autodoc-converters/src/main/java/org/eclipse/edc/plugins/autodoc/html/HtmlManifestRenderer.java

@@ -193,7 +193,7 @@ public void renderConfigurations(List<ConfigurationSetting> configuration) {
                 var clazz = index % 2 == 0 ? "even" : "odd";
                 return tr(
                         td(code(setting.getKey())),
-                        td(setting.isRequired() ? code("✓") : null).attr("align", "center"),
+                        td(setting.isRequired() ? code("x") : null).attr("align", "center"),
                         td(code(setting.getType())).attr("align", "center"),
                         td(code(setting.getDefaultValue())),
                         td(codeOrNull(setting.getPattern())).attr("align", "center"),