add note how to use parameter link anchors (CMEM-6044)

Author: seebi

cmem_plugin_base/dataintegration/description.py

@@ -224,8 +224,12 @@ class Plugin:
         If not set, an identifier will be generated from the module and class name.
     :param description: A short (few sentence) description of this plugin.
     :param documentation: Documentation for this plugin in Markdown. Note that you
-        do not need to add a first level heading to the markdown since the
+        DO NOT need to add a first level heading to the markdown since the
         documentation rendering component will add a heading anyway.
+        In case you want to have a deep link from a parameter description
+        in the task configuration to this full documentation, you can place a link
+        anchor in the form of `<a id="parameter_doc_<parameterId>">...</a>` in the
+        documentation text (the link will be generated automatically).
     :param categories: The categories to which this plugin belongs to.
     :param parameters: Available plugin parameters.
     :param icon: Optional custom plugin icon.