explain GlobalProtect portals vs. gateways in the docs
explain GlobalProtect portals vs. gateways in the docs

Signed-off-by: Daniel Lenski <e5bace4159f0f869e01725c5a04427ee0a92b09d@gmail.com>

brandt/openconnect,brandt/openconnect,brandt/openconnect,brandt/openconnect