chore: update docs

[leoparente]

This pull request updates the documentation for the device_discovery backend and the Git configuration manager. The changes enhance clarity, add new supported defaults, and provide additional examples for configuration. Below is a summary of the most important changes:

Updates to device_discovery documentation:

• Added VLAN as a supported entity in the device_discovery backend, with a link to its documentation. (docs/backends/device_discovery.md)
• Expanded the list of supported defaults to include if_type (interface type), role, tenant, and vrf for IP address and Prefix entities, as well as a comprehensive set of defaults for VLAN entities. (docs/backends/device_discovery.md) [1] [2]
• Updated example configuration to include vlan settings under the defaults section. (docs/backends/device_discovery.md)

Updates to Git configuration documentation:

• Added an important note clarifying that the config_manager and backends sections must be passed directly to the agent at startup since they are not dynamically reconfigurable. (docs/configs/git.md)
• Introduced backends configuration examples for network_discovery and device_discovery. (docs/configs/git.md)
• Provided a detailed example of a policy.yaml file, demonstrating how to declare the backend it applies to and configure schedules, defaults, and scope for device_discovery. (docs/configs/git.md)

[jajeffries]

LGTM

[github-actions]

🎉 This PR is included in version 2.0.0 🎉

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