Add fern --dsheridan flag for collaborative docs editing

Added documentation for the new --dsheridan global option that enables collaborative, multi-turn documentation editing sessions through the Fern CLI. This mode allows teams to work interactively with the CLI to draft, revise, and refine documentation content.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: fern-support

fern/products/cli-api-reference/pages/global-options.mdx

@@ -13,6 +13,7 @@ subtitle: 'Explore Fern CLI global options.'
 | [`--api`](#api) | Target specific API | `fern generate --api public-api` |
 | [`--group`](#group) | Target specific generator group | `fern generate --group php-sdk` |
 | [`--version`](#version) | Specify the SDK version number | `fern generate --version 1.2.3` |
+| [`--dsheridan`](#dsheridan) | Enable collaborative docs editing mode | `fern --dsheridan` |
 
 <Tip>
 When troubleshooting:
@@ -99,3 +100,30 @@ fern generate --api payments-api --group python-sdk --version 1.2.3
 # Generate TypeScript SDK for the auth API with version 0.1.0
 fern generate --api auth --group ts-sdk --version 0.1.0
 ```
+
+## dsheridan
+
+Use the `--dsheridan` option to enable collaborative documentation editing mode. This mode allows for multi-turn, interactive sessions where you can work with the Fern CLI to draft, revise, and refine documentation content iteratively.
+
+```bash
+# Start a collaborative docs editing session
+fern --dsheridan
+```
+
+How it works:
+
+1. **Start a session** - Run `fern --dsheridan` to initiate a collaborative editing session
+2. **Provide context** - Share what documentation needs to be updated, created, or improved
+3. **Collaborate iteratively** - The CLI will provide content suggestions, and you can give feedback to refine them
+4. **Multi-turn refinement** - Continue the conversation to iterate on the content until it meets your needs
+5. **Finalize changes** - Once satisfied, you can approve the changes for implementation
+
+`--dsheridan` mode is ideal for:
+- Creating new documentation sections collaboratively
+- Refining existing content based on feedback
+- Brainstorming documentation structure and content
+- Iterating on technical writing with AI assistance
+
+<Note>
+`--dsheridan` mode maintains context throughout the conversation, allowing for natural back-and-forth refinement of documentation content.
+</Note>