update pythonizations docs to use pythondoc

Author: m-fila

for_developers/docs/pythonizations.md

@@ -7,27 +7,15 @@ sidebar:
   nav: "for_developers"
 ---
 
-Some ROOT classes have *pythonizations* that require additional documentation. These can be added as special boxes to the rendered Doxygen page of their corresponding C++ class. As an example, see the Python-specific [RDataFrame](https://root.cern/doc/master/classROOT_1_1RDataFrame.html#python) docs. This documentation is written in the pythonization files corresponding to the original C++ class, which can be found in `<root_sources>/bindings/pyroot/pythonizations/python/ROOT/_pythonization`. Documentation is added as a module-level docstring, which should following the template below, replacing `{CLASS_NAME}` with the corresponding C++ class name, `{BLOCK_TITLE}` with the title of the documentation block (in most cases, "PyROOT" is used) and `{DOCUMENTATION_BODY}` with the documentation body, which supports the usual Doxygen tags and other formatting methods (see also the [documentation formatting tips]({{'for_developers/docs/useful_tips' | relative_url}})).
+Some ROOT classes have *pythonizations* that require additional documentation. These can be added as special boxes to the rendered Doxygen page of their corresponding C++ class. As an example, see the Python-specific [RDataFrame](https://root.cern/doc/master/classROOT_1_1RDataFrame.html#python) docs. This documentation is written in the pythonization files corresponding to the original C++ class, which can be found in `<root_sources>/bindings/pyroot/pythonizations/python/ROOT/_pythonization`.
+Documentation is added as a module-level docstring, which should follow the template below. Replace `{CLASS_NAME}`  with the corresponding C++ class name and `{DOCUMENTATION_BODY}` with the documentation body. The documentation body supports standard Doxygen tags and other formatting methods (see also the [documentation formatting tips]({{'for_developers/docs/useful_tips' | relative_url}})).
 
 ```
-r"""
-/**
-\class {CLASS_NAME}
-\brief \parblock \endparblock
-\htmlonly
-<div class="pyrootbox">
-\endhtmlonly
-\anchor python
-
-## {BLOCK_TITLE}
-
+r'''
+\pythondoc {CLASS_NAME}
 {DOCUMENTATION_BODY}
-
-\htmlonly
-</div>
-\endhtmlonly
-*/
-"""
+\endpythondoc
+'''
 ```
 
-The `\anchor` tag adds a permalink to the PyROOT box on rendered documentation page, allowing for easy linking to the Python-specific documentation by appending `#python` to the URL of the doxygen page (i.e., [https://root.cern/doc/master/classROOT_1_1RDataFrame.html#python](https://root.cern/doc/master/classROOT_1_1RDataFrame.html#python)).
+The documentation added this way can be directly linked to by appending `#python` to the URL of the doxygen page (i.e., [https://root.cern/doc/master/classROOT_1_1RDataFrame.html#python](https://root.cern/doc/master/classROOT_1_1RDataFrame.html#python)).