[FAB-4485] Expand prerequesites doc for Windows
[FAB-4485] Expand prerequesites doc for Windows

Removed link to a make command that doesn't actually work.
Added note on getting a new curl command required to successfully
go through Getting Started.

Change-Id: I92016c30d0c4b1e1f10189fcf45a23a292ed3bd7
Signed-off-by: Arnaud J Le Hors <336b2f4fb14e0a6aba0291ba81894e387297584e@us.ibm.com>

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