INSTALL.md: Update port info with better summary and fix building section

Signed-off-by: Rohit Yadav <bhaisaab@apache.org>
(cherry picked from commit 31f0c6a3bdedc7f1af605f36e2a036ea4233e5c2)

Signed-off-by: Rohit Yadav <bhaisaab@apache.org>