PEP 722: Typo fix (gh-3269)

Author: pfmoore

pep-0722.rst

@@ -80,7 +80,7 @@ as Python source code), looking for contiguous blocks of lines that start with
 the identifying characters ``##``. Whitespace is not allowed before the
 identifying ``##``. More than one metadata block may exist in a Python file.
 
-Tools reading dependency blocks MAY respect the standard Python encoding
+Tools reading metadata blocks MAY respect the standard Python encoding
 declaration. If they choose not to do so, they MUST process the file as UTF-8.
 
 Within a metadata block, whitespace after the ``##`` and at the end of the line