docs: sync Haystack API reference on Docusaurus (#12175)

Co-authored-by: sjrl <10526848+sjrl@users.noreply.github.com>

Author: HaystackBot

docs-website/reference/haystack-api/preprocessors_api.md

@@ -891,7 +891,7 @@ Example:
 from haystack import Document
 from haystack.components.preprocessors import RecursiveDocumentSplitter
 
-chunker = RecursiveDocumentSplitter(split_length=260, split_overlap=0, separators=["\n\n", "\n", ".", " "])
+chunker = RecursiveDocumentSplitter(split_length=15, split_overlap=0, separators=["\n\n", "\n", ".", " "])
 text = ('''Artificial intelligence (AI) - Introduction
 
 AI, in its broadest sense, is intelligence exhibited by machines, particularly computer systems.
@@ -900,10 +900,11 @@ doc = Document(content=text)
 doc_chunks = chunker.run([doc])
 print(doc_chunks["documents"])
 # [
-# Document(id=..., content: 'Artificial intelligence (AI) - Introduction\n\n', meta: {'original_id': '...', 'split_id': 0, 'split_idx_start': 0, '_split_overlap': []})
-# Document(id=..., content: 'AI, in its broadest sense, is intelligence exhibited by machines, particularly computer systems.\n', meta: {'original_id': '...', 'split_id': 1, 'split_idx_start': 45, '_split_overlap': []})
-# Document(id=..., content: 'AI technology is widely used throughout industry, government, and science.', meta: {'original_id': '...', 'split_id': 2, 'split_idx_start': 142, '_split_overlap': []})
-# Document(id=..., content: ' Some high-profile applications include advanced web search engines; recommendation systems; interac...', meta: {'original_id': '...', 'split_id': 3, 'split_idx_start': 216, '_split_overlap': []})
+# Document(id=..., content: 'Artificial intelligence (AI) - Introduction\n\n', meta: {'source_id': '...', 'parent_id': '...', 'split_id': 0, 'split_idx_start': 0, '_split_overlap': None, 'page_number': 1})
+# Document(id=..., content: 'AI, in its broadest sense, is intelligence exhibited by machines, particularly computer systems.\n', meta: {'source_id': '...', 'parent_id': '...', 'split_id': 1, 'split_idx_start': 45, '_split_overlap': None, 'page_number': 1})
+# Document(id=..., content: 'AI technology is widely used throughout industry, government, and science.', meta: {'source_id': '...', 'parent_id': '...', 'split_id': 2, 'split_idx_start': 142, '_split_overlap': None, 'page_number': 1})
+# Document(id=..., content: ' Some high-profile applications include advanced web search engines; recommendation systems; interac...', meta: {'source_id': '...', 'parent_id': '...', 'split_id': 3, 'split_idx_start': 216, '_split_overlap': None, 'page_number': 1})
+# Document(id=..., content: 'vehicles; generative and creative tools; and superhuman play and analysis in strategy games.', meta: {'source_id': '...', 'parent_id': '...', 'split_id': 4, 'split_idx_start': 350, '_split_overlap': None, 'page_number': 1})
 # ]
 ```