📖 missing shell argument in autocompletion snippet

[GabriFedi97]

The documentation's snippet provided to enable the autocompletion, uses the command kubebuilder completion zsh|bash|powershell|fish but the argument is missing. Looks like it should be a ready to go, copy & paste, snippet to be added to the .bash_profile but it does not work as it is, due to the missing argument.
Since the example relies on the shell bash, according to the kubebuilder completion subcommand documentation, the missing argument should be fed with bash.

[linux-foundation-easycla]

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• ✅ login: GabriFedi97 / name: Gabriele Fedi (e2c0c50)

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Hi @GabriFedi97. Thanks for your PR.

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[everettraven]

@GabriFedi97 thanks for the contribution! These changes look good to me!

/lgtm

[everettraven]

/ok-to-test

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: camilamacedo86, everettraven, GabriFedi97

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[camilamacedo86]

@GabriFedi97,

Could you please rebase this one with the master branch so we can get it merged?

[k8s-ci-robot]

New changes are detected. LGTM label has been removed.

[GabriFedi97]

@camilamacedo86 Done!