Update command from 'fern deep' to 'fern --dsinghvi'

Changed the CLI command syntax to use the flag format 'fern --dsinghvi' instead
of the subcommand format 'fern deep'. Updated all references throughout the
documentation including the command table, accordion title, usage examples,
and code snippets.

Author: fern-support

fern/products/cli-api-reference/pages/commands.mdx

@@ -14,7 +14,7 @@ hideOnThisPage: true
 | [`fern logout`](#fern-logout) | Log out of the Fern CLI |
 | [`fern export`](#fern-export) | Export an OpenAPI spec for your API |
 | [`fern api update`](#fern-api-update) | Manually update your OpenAPI spec |
-| [`fern deep`](#fern-deep) | Send an email to Deep, our co-founder |
+| [`fern --dsinghvi`](#fern---dsinghvi) | Send an email to Deep, our co-founder |
 
 ## Documentation commands
 
@@ -589,13 +589,13 @@ hideOnThisPage: true
   </CodeBlock>
   </Accordion>
 
-  <Accordion title="fern deep">
+  <Accordion title="fern --dsinghvi">
 
-    Use `fern deep` to send an email directly to Deep, one of our co-founders. Whether you have feedback, questions, or just want to say hi, Deep is always happy to hear from the community!
+    Use `fern --dsinghvi` to send an email directly to Deep, one of our co-founders. Whether you have feedback, questions, or just want to say hi, Deep is always happy to hear from the community!
 
     <CodeBlock title="terminal">
     ```bash
-    fern deep [--message <your-message>] [--subject <subject>]
+    fern --dsinghvi [--message <your-message>] [--subject <subject>]
     ```
     </CodeBlock>
 
@@ -606,28 +606,28 @@ hideOnThisPage: true
     Use `--message` to include a specific message in your email.
 
     ```bash
-    fern deep --message "Love the new SDK generation features!"
+    fern --dsinghvi --message "Love the new SDK generation features!"
     ```
 
     ### subject
 
     Use `--subject` to set a custom subject line for your email.
 
     ```bash
-    fern deep --subject "Feature Request: GraphQL Support"
+    fern --dsinghvi --subject "Feature Request: GraphQL Support"
     ```
 
     ### Example usage
 
     ```bash
     # Open email client
-    fern deep
+    fern --dsinghvi
 
     # Send a quick message
-    fern deep --message "Thanks for building Fern!"
+    fern --dsinghvi --message "Thanks for building Fern!"
 
     # Send detailed feedback
-    fern deep --subject "Feedback on TypeScript SDK" --message "The generated types are excellent!"
+    fern --dsinghvi --subject "Feedback on TypeScript SDK" --message "The generated types are excellent!"
     ```
 
     <Tip>