docs: Update some AI-related content (#47178)

Clean up some writing and add content about newer features.

Release Notes:

- N/A

docs/src/git.md

@@ -138,9 +138,11 @@ To open the stash diff view, select a stash from the stash picker and use the {#
 Zed currently supports LLM-powered commit message generation.
 You can ask AI to generate a commit message by focusing on the message editor within the Git Panel and either clicking on the pencil icon in the bottom left, or reaching for the {#action git::GenerateCommitMessage} ({#kb git::GenerateCommitMessage}) keybinding.
 
-> Note that you need to have an LLM provider configured for billing purposes, either via your own API keys or trialing/paying for Zed's hosted AI models. Visit [the AI configuration page](./ai/configuration.md) to learn how to do so.
+> Note that you need to have an LLM provider configured either via your own API keys or through Zed's hosted AI models.
+> Visit [the AI configuration page](./ai/configuration.md) to learn how to do so.
 
-You can specify your preferred model to use by providing a `commit_message_model` agent setting. See [Feature-specific models](./ai/agent-settings.md#feature-specific-models) for more information.
+You can specify your preferred model to use by providing a `commit_message_model` agent setting.
+See [Feature-specific models](./ai/agent-settings.md#feature-specific-models) for more information.
 
 ```json [settings]
 {
@@ -153,11 +155,12 @@ You can specify your preferred model to use by providing a `commit_message_model
 }
 ```
 
-To customize the format of generated commit messages, run {#action agent::OpenRulesLibrary} and select the "Commit message" rule on the left side. From there, you can modify the prompt to match your desired format.
+To customize the format of generated commit messages, run {#action agent::OpenRulesLibrary} and select the "Commit message" rule on the left side.
+From there, you can modify the prompt to match your desired format.
 
 <!-- Add media -->
 
-More advanced AI integration with Git features may come in the future.
+Any specific instructions for commit messages added to [Rules files](./ai/rules.md) are also picked up by the model tasked with writing your commit message.
 
 ## Git Integrations