Only among podman create, exec, run. The same option in
podman build, generate-systemd, and secret-create is too
different.
Should be a trivial one to review, the only difference is
a period at the end of one sentence. And, of course, the
"See Environment note" applies only to podman-create and
run, not exec, so it can't be deduplicated.
Signed-off-by: Ed Santiago <santiago@redhat.com>