Add documentation for viam machines create, update, and delete commands

[williamjhyland]

Summary

• Documents the viam machines create command for creating new machines
• Documents the viam machines update command for renaming and moving machines
• Documents the viam machines delete command for deleting machines

Context

The Viam CLI added support for these machine management commands a month or two ago, but the documentation at https://docs.viam.com/dev/tools/cli/ was not updated to reflect these additions. This PR brings the docs in sync with the current CLI capabilities.

Changes

• Added description of create, update, and delete commands to the machines section intro
• Added usage syntax and examples for the three new commands
• Added command option entries in the reference table
• Updated named arguments table with required flags and their descriptions

Test plan

• Verified commands exist in CLI with viam machines --help
• Confirmed documentation follows existing pattern for other commands
• Checked that all required arguments are documented

🤖 Generated with Claude Code

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