docs/rbd: fix typo in arg name

docs/rbd: fix typo in arg name

Replace "{image-}" with "{image-id}" in the "rbd trash rm"
command description.

Signed-off-by: N Balachandran <nibalach@redhat.com>
(cherry picked from commit f3eb489520fd4fae057e61275d16c6c8fd596f3f)

docs/rbd: replace introspect with inspect

Replace "introspect" with "inspect" in the rbd basic commands
description.

Signed-off-by: N Balachandran <nibalach@redhat.com>
(cherry picked from commit ebf2f60f784728c04d8ec59015d666bafcef8218)

docs/rbd: typo in "retrieving image information"

Replace "for the image" with "of the image".

Signed-off-by: N Balachandran <nibalach@redhat.com>
(cherry picked from commit 4fd5c134536d652ae1f9e05ecf52cb81adb3b850)