docs: remove undefined createMiddleware in Hono integration (#394)

Removes the unused (and also undefined) `createMiddleware` function from
the Hono integration docs.

<!-- This is an auto-generated comment: release notes by coderabbit.ai
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## Summary by CodeRabbit

- **Documentation**
- Updated the integration guide’s code example for clearer, up-to-date
usage instructions.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Author: johnpyp

apps/content/docs/integrations/hono.md

@@ -11,7 +11,7 @@ description: Integrate oRPC with Hono
 
 ```ts
 import { Hono } from 'hono'
-import { createMiddleware, RPCHandler } from '@orpc/server/fetch'
+import { RPCHandler } from '@orpc/server/fetch'
 
 const app = new Hono()