Revert "openstack server create" to "nova boot" in nova docs
Revert "openstack server create" to "nova boot" in nova docs

When this patch [1] was introduced, it didn't take into consideration,
the updated/changed/modified parameters when using OSC vs nova CLI, so not
every option can be used in "openstack server create" which was used in "nova boot"
and vice versa. This bug would track reverting some of these incorrect commands usage.

For example- "nova boot --block device <params1>" can be translated as
"openstack server create --block-device-mapping <params2>" where params1 and
params2 are formatted differently (hence needs more than a simple search/replace)

[1] https://review.opendev.org/#/c/404623/

Related-To: https://review.opendev.org/#/c/404623/
Change-Id: I8e400da9445101b9ff5240511c56105e26e16e4c
Closes-Bug: #1851425

klmitch/nova,rahulunair/nova,mahak/nova,mahak/nova,mahak/nova,klmitch/nova,rahulunair/nova,klmitch/nova,openstack/nova,rahulunair/nova,openstack/nova,openstack/nova,klmitch/nova