community[patch]: docstrings update (#20301)

Added missed docstrings. Format docstings to the consistent form.

libs/community/langchain_community/document_transformers/long_context_reorder.py

@@ -21,7 +21,9 @@ def _litm_reordering(documents: List[Document]) -> List[Document]:
 
 
 class LongContextReorder(BaseDocumentTransformer, BaseModel):
-    """Lost in the middle:
+    """Reorder long context.
+
+    Lost in the middle:
     Performance degrades when models must access relevant information
     in the middle of long contexts.
     See: https://arxiv.org/abs//2307.03172"""

libs/community/langchain_community/document_transformers/nuclia_text_transform.py

@@ -9,7 +9,8 @@ from langchain_community.tools.nuclia.tool import NucliaUnderstandingAPI
 
 
 class NucliaTextTransformer(BaseDocumentTransformer):
-    """
+    """Nuclia Text Transformer.
+
     The Nuclia Understanding API splits into paragraphs and sentences,
     identifies entities, provides a summary of the text and generates
     embeddings for all sentences.