[css3-backgroud] small fixes

== Typos ==
s/backgound/background/
s/writing moode/writing mode/

==
Today, we have
[[
source document
     A tree-structured document with elements and attributes, such as an
SGML or XML document [XML11].
]]
This looks like it mandates XML 1.1 support. Please add also XML 1.0

==

Is there a reason why 'border-top', 'border-bottom', 'border-right',
'border-left', and 'border' cannot define '*-rounded' and '*-image' ?

== References ==

Probably [CSS3COLOR] should reference "CSS Color Module Level 3, W3C Working
Draft 21 July 2008"
[XML11] is from "16 August 2006, edited in place 29 September 2006" and not
"4
[CSS-MOBILE] should reference "CSS Mobile Profile 2.0, W3C Candidate
Recommendation 1 August 2008"

Mohamed

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