Fix typo in docstring.
diff --git a/Lib/email/header.py b/Lib/email/header.py
index e78547c..d1fd9a0 100644
--- a/Lib/email/header.py
+++ b/Lib/email/header.py
@@ -281,7 +281,7 @@
75-character length limit on any given encoded header field, so
line-wrapping must be performed, even with double-byte character sets.
- Optional maxlinelen specifies the maxiumum length of each generated
+ Optional maxlinelen specifies the maximum length of each generated
line, exclusive of the linesep string. Individual lines may be longer
than maxlinelen if a folding point cannot be found. The first line
will be shorter by the length of the header name plus ": " if a header