add message_trimming to docs

docs/my-website/docs/completion/message_trimming.md

@@ -0,0 +1,26 @@
+# Trimming Messages - litellm.safe_messages
+**Use litellm.safe_messages() to ensure messages does not exceed a model's token limit or specified `max_tokens`**
+
+## Usage 
+```python
+from litellm import completion
+from litellm.utils import safe_messages
+
+response = completion(
+  model=model,
+  messages=safe_messages(messages, model) # safe_messages ensures tokens(messages) < tokens (model)
+)
+
+```
+
+## Parameters
+
+The function uses the following parameters:
+
+- `messages`: This should be a list of input messages 
+
+- `model`: This is the LiteLLM model being used. This parameter is optional, as you can alternatively specify the `max_tokens` parameter.
+
+- `system_message`: This is a string containing an optional system message that will be preserved at the beginning of the conversation. This parameter is optional and set to `None` by default.
+
+- `trim_ratio`: This represents the target ratio of tokens to use following trimming. It's default value is 0.75, which implies that messages will be trimmed to utilise about 75%

docs/my-website/sidebars.js

@@ -31,9 +31,10 @@ const sidebars = {
       items: [
         "completion/input", 
         "completion/output", 
+        "completion/stream", 
+        "completion/message_trimming",
         "completion/model_alias", 
         "completion/reliable_completions", 
-        "completion/stream", 
         "completion/batching",
         "completion/mock_requests",
       ],