Manural.rst: refactor header line token. start to document FE annotation element.

extension/Source/core/AbstractBuildForm.php

@@ -3182,7 +3182,7 @@ abstract class AbstractBuildForm {
 
         Support::setIfNotSet($formElement, FE_ANNOTATE_USER_UID);
         Support::setIfNotSet($formElement, FE_ANNOTATE_USER_NAME);
-        Support::setIfNotSet($formElement, FE_ANNOTATE_USER_NAME);
+        Support::setIfNotSet($formElement, FE_ANNOTATE_USER_AVATAR);
 
         $dataHighlight=HelperFile::getFileTypeHighlight($formElement[FE_HIGHLIGHT]??'',$formElement[FE_TEXT_SOURCE] );