[BioC] drop the quote mark surround getBioC(libName = "all"), it is misl eading.

[Fan, Wenhong]

hi,
On the Bioconductor web, the HOW TO page, there is section on how to
download and install Bioconductor using getBioC.R script. The page is like
this:
>From your R session, type source("http://www.bioconductor.org/getBioC.R"),
this will download the getBioC functionality into your R session. 
To install Bioconductor packages, use the function "getBioC" as follows. To
download and install all packages, type "getBioC(libName = "all")". For only
a subset of packages, use the following  values for the libName argument
instead of "all"....

I suggest you simply say type getBioC(libName = "all"), instead of type
"getBioC(libName = "all")", since the user just need to type getBioC(libName
= "all") without the quote mark. 

I believe it has been misleading people, so please change it. Thanks.