Remove outdated section

Author: zklaus

peps/pep-0780.rst

@@ -154,17 +154,6 @@ The keywords "**MUST**", "**MUST NOT**", "**REQUIRED**", "**SHALL**",
 and "**OPTIONAL**"" in this document are to be interpreted as described in
 :rfc:`RFC 2119 <2119>`.
 
-Concepts
---------
-
-ABI features are a clear description of certain properties of the Python
-interpreter. While some of these features can be queried already today, they
-are not easily nor uniformly accessible.
-
-Hence, the proposed feature MUST be made available via the Python standard
-library as ``sys.abi_features``, and as the new environment marker variable
-``sys_abi_features``.
-
 ABI Features
 ------------