rename list index to summary index part 2 (#7531)

docs/api_reference/indices/list.rst

docs/core_modules/data_modules/index/composability.md

docs/core_modules/data_modules/index/document_management.md

docs/core_modules/data_modules/index/index_guide.md

docs/core_modules/data_modules/index/modules.md

...ry_modules/query_engine/advanced/query_transformations.md

docs/core_modules/query_modules/retriever/retriever_modes.md

docs/core_modules/query_modules/retriever/usage_pattern.md

docs/core_modules/query_modules/router/root.md

docs/core_modules/supporting_modules/cost_analysis/root.md

docs/core_modules/supporting_modules/playground/root.md

docs/end_to_end_tutorials/chatbots/building_a_chatbot.md

docs/end_to_end_tutorials/question_and_answer.md

...torials/question_and_answer/terms_definitions_tutorial.md

docs/end_to_end_tutorials/usage_pattern.md

docs/examples/analysis/PlaygroundDemo.ipynb

docs/examples/callbacks/LlamaDebugHandler.ipynb

...examples/composable_indices/ComposableIndices-Prior.ipynb

docs/examples/data_connectors/deplot/DeplotReader.ipynb

docs/examples/docstore/DocstoreDemo.ipynb