CryptoPkg/OpensslLib: Fix the documentation about submodule update

CryptoPkg/OpensslLib: Fix the documentation about submodule update

This patch is to drop "--remote" option from the original suggested
submodule update command ("$ git submodule update --recursive
--remote") in HOWTO document.

"--remote" option will integrate changes from the upstream subproject
with the submodules's "current HEAD", instead of using the edk2
superproject's "recorded SHA-1".

It is important here for the edk2 consumers to updating the working
tree of the submodules to match the commit / release tag that the
superproject expects. So removing "--remote" option to fix this
documentation issue here.

Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Ye Ting <ting.ye@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Long Qin <qin.long@intel.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>