fix: reflect changes in aquaproj/aqua for shell setup example

[akinomyoga]

See the commit message. This reflects the changes in aquaproj/aqua#3297 to the online documentation.

References:

• Improvements on the example configuration for completion in Bash aqua#3294
• fix: improve the completion settings suggested in aqua completion --help aqua#3297

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[suzuki-shunsuke]

Thank you for your contribution!

But we generate usage.md by the command cmdx usage.

aquaproj.github.io/docs/reference/usage.md

Line 7 in b31433e

<!-- This is generated by scripts/generate-usage.sh. Don't edit this file directly. -->

aquaproj.github.io/cmdx.yaml

Lines 12 to 18 in d97c279

	- name: update-usage
	short: usage
	description: Update Usage
	usage: Update Usage
	script: |
	set -euo pipefail
	bash scripts/generate-usage.sh > docs/reference/usage.md

TODO: We should update contributing.md

[akinomyoga]

But we generate usage.md by the command cmdx usage.

aquaproj.github.io/docs/reference/usage.md

Line 7 in b31433e

<!-- This is generated by scripts/generate-usage.sh. Don't edit this file directly. -->

Thank you. I missed it.

[suzuki-shunsuke]

TODO: We should update contributing.md

• update contributing.md #1234