Fix same typo in docs.
diff --git a/Doc/library/email.header.rst b/Doc/library/email.header.rst
index 7e87dac..113a6b8 100644
--- a/Doc/library/email.header.rst
+++ b/Doc/library/email.header.rst
@@ -63,7 +63,7 @@
character set is used both as *s*'s initial charset and as the default for
subsequent :meth:`append` calls.
- The maximum line length can be specified explicit via *maxlinelen*. For
+ The maximum line length can be specified explicitly via *maxlinelen*. For
splitting the first line to a shorter value (to account for the field header
which isn't included in *s*, e.g. :mailheader:`Subject`) pass in the name of the
field in *header_name*. The default *maxlinelen* is 76, and the default value