csprd03 - not changing the skeleton content

In section "4.2.2.3 skeleton" there is the following PR:

[[
Modifiers and Enrichers processing an XLIFF Document that contains a <skeleton> element MUST NOT change those elements.
]]

The text is slightly strange as it refers to *a skeleton" then at "those elements". It may also be clearer to explicitly mention the
content.

I suggest the following re-wording:

"Modifiers and Enrichers processing an XLIFF Document that contains a <skeleton> element MUST NOT change that element and its
content."


-yves