[DOC] Remove wildcard escape

[turbotimon]

Description of the Pull Request (PR):

I propose surrounding the wildcard with ticks for the following reasons:

• Consistent with other examples on this page:

  apptainer-userdocs/running_services.rst

  Line 123 in f5392a7

  $ {command} instance list '*2'

• No additional note needed
• Therefore hopefully helping less experienced users

[DrDaveD]

That looks like a fine change. However you need to do your commit with git commit -s to satisfy the DCO as described in the apptainer project CONTRIBUTING Getting Started section.

[turbotimon]

@DrDaveD thanks for letting me know and sorry for not reading the CONTRIBUTING up front.

I changed the commit and hope it's fine now