Update system logic documentation for multiplier change (6→9)

[Copilot]

System processing logic multiplier changed from 6 to 9. Documentation was stale and showed multiplier of 2.

Changes

• Updated process_data function description: multiplier 2 → 9
• Updated example calculation: [1,2,3] now outputs 54 (was 12)

Input: `[1, 2, 3]`
Output: `54` (because 1*9 + 2*9 + 3*9 = 54)

File modified: my-docs-site/docs/test-system-logic.md

Original prompt

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This section details on the original issue you should resolve

<issue_title>Docs Update: System Logic Changed</issue_title>
<issue_description>The system logic in system_logic.py has been updated.

Commit Message:
Change multiplier from 6 to 9 in processing logic

Task for Agent:

1. Read the code changes in the commit.
2. Find the documentation page 'System Logic Test' (docs/test-system-logic.md).
3. Update the description of the math logic to match the new code.
   </issue_description>

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

• Fixes Docs Update: System Logic Changed #7

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