-HEADER-FIELED is a regexp or list of regexps as mail header field name
-for gathering mail addresses. If HEADER-FIELED is a string, then it's
-used for just matching pattern. If HEADER-FIELED is a list of strings,
+HEADER-FIELD is a regexp or list of regexps as mail header field name
+for gathering mail addresses. If HEADER-FIELD is a string, then it's
+used for just matching pattern. If HEADER-FIELD is a list of strings,