doc, cmd: Tweak the wording and error messages for consistency

[debarshiray]

The useradd(8) and usermod(8) manuals use the term login shell, except one instance in useradd(8) where it says default login shell [1,2]. The toolbox-init-container(1) manual and the init-container command already use login shell, and it's shorter than default shell. So, it wins.

Fallout from the following:

• 6c86cab
• 59055cf
• 662bd89
• 8f30d71

[1] https://man7.org/linux/man-pages/man8/useradd.8.html

[2] https://man7.org/linux/man-pages/man8/usermod.8.html

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request standardizes the terminology used for user shells across both documentation and command-line error messages. By consistently using "login shell" instead of "default shell," the project aligns with established Linux manual pages like useradd(8) and usermod(8), improving clarity and consistency for users.

Highlights

• Documentation Update: The doc/toolbox-enter.1.md file was updated to replace "default shell" with "login shell" for improved consistency.
• Error Message Consistency: Error messages across src/cmd/create.go, src/cmd/enter.go, and src/cmd/rootMigrationPath.go were updated to refer to "login shell" instead of "default shell".

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Changelog

• doc/toolbox-enter.1.md
  • Updated the description to use "login shell" instead of "default shell".
• src/cmd/create.go
  • Modified the error message for when the user's shell cannot be retrieved, changing "default shell" to "login shell".
• src/cmd/enter.go
  • Modified the error message for when the user's shell cannot be retrieved, changing "default shell" to "login shell".
• src/cmd/rootMigrationPath.go
  • Modified the error message for when the user's shell cannot be retrieved, changing "default shell" to "login shell".

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[gemini-code-assist]

Code Review

This pull request updates the terminology from 'default shell' to 'login shell' across documentation and error messages for consistency. The changes are straightforward and align with the stated goal. I have reviewed the code and found no issues.

[softwarefactory-project-zuul]

Build succeeded.
https://softwarefactory-project.io/zuul/t/local/buildset/195c3442f4f64db28401514b21b98260

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✔️ unit-test-migration-path-for-coreos-toolbox SUCCESS in 3m 10s
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✔️ system-test-fedora-rawhide-commands-options SUCCESS in 1h 18m 45s
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✔️ system-test-fedora-rawhide-runtime-environment-ubuntu SUCCESS in 11m 31s
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✔️ system-test-fedora-43-runtime-environment-ubuntu SUCCESS in 11m 37s
✔️ system-test-fedora-42-commands-options SUCCESS in 1h 14m 30s
✔️ system-test-fedora-42-runtime-environment-arch-fedora SUCCESS in 1h 03m 56s
✔️ system-test-fedora-42-runtime-environment-ubuntu SUCCESS in 11m 31s