porters-handbook typo: On of -> One of

[Vladimir Chukharev]

$ grep -rn 'On of the easiest ways to learn' /usr/doc/
/usr/doc/en_US.ISO8859-1/books/porters-handbook/book.sgml:7466: <para>On  
of the easiest ways to learn about updates that have

Best regrds,
-- 
V.Chukharev