fixup! Reorder requirements file decoding

Author: matthewhughes934

docs/html/reference/requirements-file-format.md

@@ -56,15 +56,14 @@ examples of all these forms, see {ref}`pip install Examples`.
 
 ### Encoding
 
-It is simplest to encode your requirements files with UTF-8.
-The process for decoding requirements files is:
-
-- Check for any Byte Order Mark at the start of the file and if found use
-  the corresponding encoding to decode the file.
-- Check for any {pep}`263` style comment (e.g. `# -*- coding: <encoding name> -*-`)
-  and if found decode with the given encoding.
-- Try and decode with UTF-8, and if that fails,
-- fallback to trying to decode using the locale defined encoding.
+The default encoding for requirement files is `UTF-8` unless a different
+encoding is specified using a {pep}`263` style comment (e.g. `# -*- coding:
+<encoding name> -*-`).
+
+```{warning}
+pip will fallback to the locale defined encoding if `UTF-8` decoding fails. This is a quirk
+of pip's parser. This behaviour is *deprecated* and should not be relied upon.
+```
 
 ### Line continuations