samples: update ACI samples for capability coupling rules

[surajkumar-08]

• Fix swapped ImageSemantic/ImageOcr capability checks in AppIndexCapability
• Add capability coupling comments to GetOrCreateIndex calls in all three ACI samples (SemanticSearch, KnowledgeRetrieval, AppIndexCapability)
• Document that TextLexical suppression is only honored when TextSemantic is also Suppressed, and that ImageOcr/ImageSemantic are independent

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