lic: update rules CC BY SA 3.0

[davidgamez]

Description

This pull request updates the classification system prompt documentation to clarify when to use [verbatim] versus [inferred] evidence strings and to prevent mixing both types for the same rule. It also adjusts a reference example to align with the new guidance.

Clarifications to evidence string usage:

• Updated the instructions to specify that [verbatim] should be used only when a direct clause exists, and [inferred] only when no direct clause is present. It is now explicitly prohibited to use both [verbatim] and [inferred] for the same rule—if verbatim evidence is available, only use that. [1] [2]
• Clarified that multiple evidence strings are allowed only if they are drawn from distinct clauses, not by repeating the same reasoning with different prefixes.

Reference example update:

• Modified the Creative Commons BY-ND 2.0 example to use only [inferred] for "commercial-use" permission, reflecting the new rule that prohibits mixing [verbatim] and [inferred] for the same rule.