Fix deployer decision points doc: Utility → Automatable

[Copilot]

The Deployer decision model was updated in code (via #248) to use Automatable instead of Utility (which was a compound of Automatable + Value Density), but the documentation at docs/howto/deployer_tree.md was not updated to match.

• Updated the decision points list to reference Automatable instead of Utility, matching the current DEPLOYER_3 model definition

-- [*Utility*](../reference/decision_points/utility.md) - The more useful a vulnerability is to an attacker, the more likely it is to be given a higher priority.
+- [*Automatable*](../reference/decision_points/automatable.md) - The more automatable a vulnerability is, the more likely it is to be given a higher priority.

Note: The dynamic content sections (decision point details, decision table, mermaid diagram) were already correct since they render from the Python code via markdown-exec.

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Original prompt

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This section details on the original issue you should resolve

<issue_title>SSVC Deployer Decision Points doc is out of date</issue_title>
<issue_description>Describe the bug

At some point in the recent past, we changed the Deployer decision model to use Automatable instead of Utility (which was comprised of Automatable and Value Density). While this change happened in our code, we did not update the accompanying markdown documentation.

To Reproduce
Steps to reproduce the behavior:

1. Go to https://certcc.github.io/SSVC/howto/deployer_tree/#deployer-decision-points
2. Observe that we list "Utility" instead of "Automatable"

Expected behavior

Update https://github.com/CERTCC/SSVC/blob/main/docs/howto/deployer_tree.md to reflect the Utility → Automatable change.

</issue_description>

Comments on the Issue (you are @copilot in this section)

@ahouseholder Linking for posterity:

• Replace Utility with Automatable in Deployer Tree #238 was the issue that original prompted the change
• Replace Utility with Automatable in Deployer tree #248 was the PR that made the change</comment_new>

• Fixes SSVC Deployer Decision Points doc is out of date #1045

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Pull request overview

Updates the Deployer decision model documentation to match the current SSVC Deployer (DEPLOYER_3) definition, replacing the outdated Utility decision point reference with Automatable.

Changes:

• Replaced the Deployer decision-point list entry from Utility to Automatable and updated the link/description accordingly.