docs: update CLI command in documentation

[andrefelipe18]

This pull request updates the documentation for the Langfy package to improve clarity and accuracy. The most significant changes include updating the command to publish the configuration file and adding spacing for better readability in lists.

Updates to commands:

• Changed the command to publish the configuration file from php artisan vendor:publish --tag="langfy" to php artisan vendor:publish --tag="langfy-config" in both docs/configuration.md and docs/introduction.md for consistency and accuracy. [1] [2]

Formatting improvements:

• Added spacing before list items under "Supported Values" in docs/configuration.md to improve readability.
• Added spacing before list items under "Recommendations" in docs/configuration.md to enhance clarity.

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