docs: Add missing --ignore flag example to podman rm man page

[Raghul-M]

Does this PR introduce a user-facing change?

None

Add missing --ignore flag example to podman-rm man page

This PR addresses the missing example for the --ignore flag in the podman rm
command documentation. The --ignore flag is particularly useful for scripting
scenarios where containers may or may not exist.

Added example shows:

• How to use --ignore when removing multiple containers
• Demonstrates that the command succeeds even when some containers don't exist
• Shows expected output when containers are successfully removed

The --ignore flag prevents errors when trying to remove non-existent containers,
making it valuable for automation scripts and cleanup operations where container
existence is uncertain.

Before this change, users could see the --ignore flag was available in the
OPTIONS section but had no practical example of how to use it effectively.

This improvement helps users understand when and how to use the --ignore flag
for more robust container management scripts.

Fixes: #26369

Signed-off-by: Raghul-M [email protected]

[Raghul-M]

/assign @baude

[Honny1]

Thanks, LGTM

[Raghul-M]

@baude can you approve and merge this PR

[baude]

/approve
/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: baude, Honny1, Raghul-M

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