Fix basic usage docs example about environment activation

[LeoTheGriff]

Documentation:

Very minor change deprecating poetry shell in an example in 'Basic Usage' docs; loosely relates to change #9963.

Summary by Sourcery

Documentation:

• Clarify the recommended way to activate a project environment in the basic usage documentation.

[sourcery-ai]

Reviewer's Guide by Sourcery

This PR deprecates the use of poetry shell in the basic usage documentation, replacing it with poetry env activate. This change aligns the documentation with the updated command for activating the project's virtual environment.

Sequence diagram for environment activation commands

sequenceDiagram
    participant User as Developer
    participant Poetry as Poetry CLI
    participant VEnv as Virtual Environment

    Note over User, VEnv: Old workflow
    User->>Poetry: poetry shell
    Poetry-->>VEnv: Activate environment (Deprecated)
    VEnv-->>User: Shell with activated environment

    Note over User, VEnv: New workflow
    User->>Poetry: poetry env activate
    Poetry-->>VEnv: Activate environment
    VEnv-->>User: Shell with activated environment

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File-Level Changes

Change	Details	Files
Replaced poetry shell with poetry env activate in the example demonstrating how to activate the project's virtual environment.	Replaced the command poetry shell with poetry env activate. Updated the example to reflect the preferred way of activating the Poetry environment.	docs/basic-usage.md

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[sourcery-ai]

Hey @LeoTheGriff - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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