PEP 706: Fix trivial typo (#3017)

Author: cpburnz

pep-0706.rst

@@ -560,7 +560,7 @@ The ``'tar'`` filter exposes features specific to UNIX-like filesystems,
 so it could be named ``'unix'``.
 Or ``'unix-like'``, ``'nix'``, ``'*nix'``, ``'posix'``?
 
-Fetaure-wise, *tar format* and *UNIX-like filesystem* are essentially
+Feature-wise, *tar format* and *UNIX-like filesystem* are essentially
 equivalent, so ``tar`` is a good name.