docs: clarify SmartAI MOVE_FORWARD targeting

[Copilot]

The wiki text for SMART_ACTION_MOVE_FORWARD no longer matched current SmartAI behavior after the merged quest fix for A Plague Upon Thee. This updates the documentation so the action semantics and target usage are explicit.

• What changed

  • Updated /docs/smart_scripts.md
  • Updated /docs/es/smart_scripts.md

• Behavior clarification

  • SMART_ACTION_MOVE_FORWARD is documented as moving the targeted creature(s) forward, not implicitly only the source.
  • Added the required usage note that SMART_TARGET_SELF should be used when the source itself is meant to move.

• Why this matters

  • Aligns the wiki with the SmartAI behavior used by the merged termite summon quest fix.
  • Reduces ambiguity when using MOVE_FORWARD in SmartAI templates and summoned-unit flows.

| SMART_ACTION_MOVE_FORWARD | 46 | distance | ... | move the targeted creature(s) forward for the specified distance (point movement); use SMART_TARGET_SELF to move the source itself |

• Fixes Wiki Update Needed: fix(DB/Quest): Summon Termites for A Plague Upon Thee #1270

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