Add anchor links for license and license-files

Author: cdce8p

source/guides/writing-pyproject-toml.rst

@@ -322,6 +322,8 @@ You can also specify the format explicitly, like this:
    readme = {file = "README.txt", content-type = "text/x-rst"}
 
 
+.. _license:
+
 ``license``
 -----------
 
@@ -386,6 +388,8 @@ license, both to avoid confusion and because some organizations avoid software
 whose license is unapproved.)
 
 
+.. _license-files:
+
 ``license-files``
 -----------------