Tweak README

Author: alexrudall

README.md

@@ -161,7 +161,7 @@ client.models.retrieve(id: "text-ada-001")
   - text-babbage-001
   - text-curie-001
 
-### GPT
+### Chat
 
 GPT is a model that can be used to generate text in a conversational style. You can use it to [generate a response](https://platform.openai.com/docs/api-reference/chat/create) to a sequence of [messages](https://platform.openai.com/docs/guides/chat/introduction):
 
@@ -176,9 +176,9 @@ puts response.dig("choices", 0, "message", "content")
 # => "Hello! How may I assist you today?"
 ```
 
-### Streaming GPT
+### Streaming Chat
 
-[Quick guide to streaming GPT with Rails 7 and Hotwire](https://gist.github.com/alexrudall/cb5ee1e109353ef358adb4e66631799d)
+[Quick guide to streaming Chat with Rails 7 and Hotwire](https://gist.github.com/alexrudall/cb5ee1e109353ef358adb4e66631799d)
 
 You can stream from the API in realtime, which can be much faster and used to create a more engaging user experience. Pass a [Proc](https://ruby-doc.org/core-2.6/Proc.html) (or any object with a `#call` method) to the `stream` parameter to receive the stream of completion chunks as they are generated. Each time one or more chunks is received, the proc will be called once with each chunk, parsed as a Hash. If OpenAI returns an error, `ruby-openai` will raise an error.
 
@@ -195,7 +195,7 @@ client.chat(
 # => "Anna is a young woman in her mid-twenties, with wavy chestnut hair that falls to her shoulders..."
 ```
 
-Note: OpenAPI currently does not report token usage for streaming responses. To count tokens while streaming, try `OpenAI.rough_token_count` or [tiktoken_ruby](https://github.com/IAPark/tiktoken_ruby). Also, each call to the stream proc corresponds to a single token, so you can count the number of calls to the proc to get the completion token count.
+Note: OpenAPI currently does not report token usage for streaming responses. To count tokens while streaming, try `OpenAI.rough_token_count` or [tiktoken_ruby](https://github.com/IAPark/tiktoken_ruby). We think that each call to the stream proc corresponds to a single token, so you can also try counting the number of calls to the proc to get the completion token count.
 
 ### Functions