docs: LLM - Fixed the rendering of the example usage code blocks.

PiperOrigin-RevId: 534651247

vertexai/language_models/_language_models.py

@@ -296,7 +296,7 @@ def __repr__(self):
 class TextGenerationModel(_LanguageModel):
     """TextGenerationModel represents a general language model.
 
-    Examples:
+    Examples::
 
         # Getting answers:
         model = TextGenerationModel.from_pretrained("text-bison@001")
@@ -383,7 +383,7 @@ def _batch_predict(
 class _ChatModel(TextGenerationModel):
     """ChatModel represents a language model that is capable of chat.
 
-    Examples:
+    Examples::
 
         # Getting answers:
         model = ChatModel.from_pretrained("chat-bison@001")
@@ -488,7 +488,7 @@ def send_message(
 class TextEmbeddingModel(_LanguageModel):
     """TextEmbeddingModel converts text into a vector of floating-point numbers.
 
-    Examples:
+    Examples::
 
         # Getting embedding:
         model = TextEmbeddingModel.from_pretrained("textembedding-gecko@001")
@@ -537,7 +537,7 @@ class InputOutputTextPair:
 class ChatModel(_LanguageModel):
     """ChatModel represents a language model that is capable of chat.
 
-    Examples:
+    Examples::
 
         chat_model = ChatModel.from_pretrained("chat-bison@001")