Add autoID for definition terms

Fixes #13403
See #11566

Co-authored-by: Joe Mooring <joe@mooring.com>

markup/markup_config/config.go

@@ -41,6 +41,10 @@ type Config struct {
 	AsciidocExt asciidocext_config.Config
 }
 
+func (c *Config) Init() error {
+	return c.Goldmark.Init()
+}
+
 func Decode(cfg config.Provider) (conf Config, err error) {
 	conf = Default
 
@@ -57,6 +61,10 @@ func Decode(cfg config.Provider) (conf Config, err error) {
 		return
 	}
 
+	if err = conf.Init(); err != nil {
+		return
+	}
+
 	if err = highlight.ApplyLegacyConfig(cfg, &conf.Highlight); err != nil {
 		return
 	}