Update 'Using Private Data in Fabric' tutorial (Backport #1875)

(cherry picked from commit 17858a5)

Signed-off-by: Waleed Mortaja <waleedmortaja@protonmail.com>

Update 'Using Private Data in Fabric' tutorial

Signed-off-by: Chris Gabriel <chris_gabriel_98@yahoo.com>

fix invoke command on first ReadAsset

Signed-off-by: Chris Gabriel <chris_gabriel_98@yahoo.com>

minor grammatical fixes

Signed-off-by: Chris Gabriel <chris_gabriel_98@yahoo.com>

resolve comments

Signed-off-by: Chris Gabriel <chris_gabriel_98@yahoo.com>

Add Asset Transfer section header and delete pipfile

Signed-off-by: Chris Gabriel <chris_gabriel_98@yahoo.com>

address comments and add use case section

Signed-off-by: Chris Gabriel <chris_gabriel_98@yahoo.com>