(docs) proxy add info on testing caching

docs/my-website/docs/simple_proxy.md

@@ -172,9 +172,7 @@ On a successfull deploy https://dashboard.render.com/ should display the followi
 ## Advanced
 ### Caching - Completion() and Embedding() Responses
 
-#### Caching on Redis
-In order to enable Redis caching:
-- Add the following credentials to your server environment - litellm will begin caching your responses
+Enable caching by adding the following credentials to your server environment
 
   ```
   REDIS_HOST = ""       # REDIS_HOST='redis-18841.c274.us-east-1-3.ec2.cloud.redislabs.com'
@@ -182,6 +180,28 @@ In order to enable Redis caching:
   REDIS_PASSWORD = ""   # REDIS_PASSWORD='liteLlmIsAmazing'
   ```
 
+#### Test Caching 
+Send the same request twice:
+```shell
+curl http://0.0.0.0:8000/v1/chat/completions \
+  -H "Content-Type: application/json" \
+  -d '{
+     "model": "gpt-3.5-turbo",
+     "messages": [{"role": "user", "content": "write a poem about litellm!"}],
+     "temperature": 0.7
+   }'
+
+curl http://0.0.0.0:8000/v1/chat/completions \
+  -H "Content-Type: application/json" \
+  -d '{
+     "model": "gpt-3.5-turbo",
+     "messages": [{"role": "user", "content": "write a poem about litellm!"}],
+     "temperature": 0.7
+   }'
+```
+
+#### Control caching per completion request
+