pythongh-118100: Improve links in ast.rst

Author: sobolevn

Doc/library/ast.rst

@@ -2536,16 +2536,12 @@ to stdout.  Otherwise, the content is read from stdin.
     code that generated them. This is helpful for tools that make source code
     transformations.
 
-    `leoAst.py <https://leoeditor.com/appendices.html#leoast-py>`_ unifies the
+    `leoAst.py <https://leo-editor.github.io/leo-editor/appendices.html#leoast-py>`_
+    unifies the
     token-based and parse-tree-based views of python programs by inserting
     two-way links between tokens and ast nodes.
 
     `LibCST <https://libcst.readthedocs.io/>`_ parses code as a Concrete Syntax
     Tree that looks like an ast tree and keeps all formatting details. It's
     useful for building automated refactoring (codemod) applications and
     linters.
-
-    `Parso <https://parso.readthedocs.io>`_ is a Python parser that supports
-    error recovery and round-trip parsing for different Python versions (in
-    multiple Python versions). Parso is also able to list multiple syntax errors
-    in your python file.