Using `html` code-blocks for examples isn't so nice when viewing the docs over Trac, so change them to `xml`.
Using `html` code-blocks for examples isn't so nice when viewing the docs over Trac, so change them to `xml`.

git-svn-id: 35afe1d183cbd4849519a30d21151995795e8f1d@728 de761a21-4c15-0410-92fa-db90950b6ec0

dag/genshi,davidfraser/genshi,dag/genshi,dag/genshi,davidfraser/genshi,davidfraser/genshi,dag/genshi,davidfraser/genshi