[Checkins] [zopefoundation/RestrictedPython] e3d956: readd some of the documentation that helps to unde...

[Alexander Loechel]

  Branch: refs/heads/fix_contributing_docs
  Home:   https://github.com/zopefoundation/RestrictedPython
  Commit: e3d956a1e57098fbf361d7f96e01142c6f5e3a6d
      https://github.com/zopefoundation/RestrictedPython/commit/e3d956a1e57098fbf361d7f96e01142c6f5e3a6d
  Author: Alexander Loechel <Alexander.Loechel at lmu.de>
  Date:   2019-09-04 (Wed, 04 Sep 2019)

  Changed paths:
    A docs/contributing/ast/python2_6.ast
    A docs/contributing/ast/python2_7.ast
    A docs/contributing/ast/python3_0.ast
    A docs/contributing/ast/python3_1.ast
    A docs/contributing/ast/python3_2.ast
    A docs/contributing/ast/python3_3.ast
    A docs/contributing/ast/python3_4.ast
    A docs/contributing/ast/python3_5.ast
    A docs/contributing/ast/python3_6.ast
    A docs/contributing/ast/python3_7.ast
    A docs/contributing/ast/python3_8.ast
    M docs/contributing/index.rst

  Log Message:
  -----------
  readd some of the documentation that helps to understand how RestrictedPython works internally, and the AST Grammars for comparision