Fix typo in docs.
Fix typo in docs.

svn path=/trunk/; revision=2133

zsx/pango,bratsche/pango,kari-lentz/alpha-pango,kari-lentz/alpha-pango,OpenInkpot-archive/iplinux-pango1.0,OpenInkpot-archive/iplinux-pango1.0,OpenInkpot-archive/iplinux-pango1.0,zsx/pango,danny-ku/pango,bratsche/pango,Distrotech/pango,zsx/pango,zsx/pango,bratsche/pango,danny-ku/pango,Distrotech/pango,Distrotech/pango,bratsche/pango,kari-lentz/alpha-pango,kari-lentz/alpha-pango,danny-ku/pango