[BioC] Bioconductor documentation

[Gordon Smyth]

Oops, I meant to say

"The affy package for example outputs exprSet objects which contain 
*log-expression* values while coercion to exprSet from an marrayNorm object 
produces an exprSet object which contains log-ratios. For this reason it 
would be impossible for lmFit() to output a different class of object 
depending on the type of input data."

Actually an exprSet can in principle contain almost any sort of expression 
data. The exprs slot can contain absolute (not logged) expression values 
for example.

Gordon