Fix email.parser.BytesParser and BytesHeaderParser method args (#2548)

Fixes #2502

Author: jleclanche

stdlib/3/email/parser.pyi

@@ -2,8 +2,8 @@
 
 import email.feedparser
 from email.message import Message
-from typing import Callable, Optional, TextIO, BinaryIO
 from email.policy import Policy
+from typing import BinaryIO, Callable, Optional, TextIO
 
 FeedParser = email.feedparser.FeedParser
 BytesFeedParser = email.feedparser.BytesFeedParser
@@ -24,10 +24,10 @@ class BytesHeaderParser(BytesParser):
     def __init__(self, _class: Callable[[], Message] = ..., *,
                  policy: Policy = ...) -> None: ...
     def parse(self, fp: BinaryIO, headersonly: bool = ...) -> Message: ...
-    def parsestr(self, text: str, headersonly: bool = ...) -> Message: ...
+    def parsebytes(self, text: bytes, headersonly: bool = ...) -> Message: ...
 
 class BytesParser:
     def __init__(self, _class: Callable[[], Message] = ..., *,
                  policy: Policy = ...) -> None: ...
     def parse(self, fp: BinaryIO, headersonly: bool = ...) -> Message: ...
-    def parsestr(self, text: str, headersonly: bool = ...) -> Message: ...
+    def parsebytes(self, text: bytes, headersonly: bool = ...) -> Message: ...