ob-sql.el: fix typo preventing mysql table headers from being parsed

* ob-sql.el (org-babel-execute:sql): fix typo (introduced in 8c2e232)
which prevented correct parsing of mysql table headers.

lisp/ob-sql.el

@@ -181,7 +181,7 @@ SET COLSEP '|'
 	(progn (insert-file-contents-literally out-file) (buffer-string)))
       (with-temp-buffer
 	(cond
-	 ((memq (intern engine) '(dbi myslq postgresql))
+	 ((memq (intern engine) '(dbi mysql postgresql))
 	  ;; Add header row delimiter after column-names header in first line
 	  (cond
 	   (colnames-p