Fix more incorrect code blocks in doc strings (#9073)

Fix 2 more incorrect code blocks in strings

libs/langchain/langchain/chains/base.py

@@ -577,7 +577,7 @@ class Chain(Serializable, Runnable[Dict[str, Any], Dict[str, Any]], ABC):
             A dictionary representation of the chain.
 
         Example:
-            ..code-block:: python
+            .. code-block:: python
 
                 chain.dict(exclude_unset=True)
                 # -> {"_type": "foo", "verbose": False, ...}

libs/langchain/langchain/embeddings/cache.py

@@ -59,7 +59,7 @@ class CacheBackedEmbeddings(Embeddings):
 
     Examples:
 
-        ..code-block:: python
+        .. code-block: python
 
             from langchain.embeddings import CacheBackedEmbeddings, OpenAIEmbeddings
             from langchain.storage import LocalFileStore