fix: typo & redirect signature (#1218)

Author: huseeiin

src/routes/solid-router/reference/response-helpers/redirect.mdx

@@ -64,11 +64,11 @@ When returning from a nested method, the parent method will continue to execute,
 ### TypeScript Signature
 
 ```typescript
-interface ResponseOptions & Omit<ResponseInit, "body"> {
+type RouterResponseInit = Omit<ResponseInit, "body"> & {
   revalidate?: string | string[];
-} | number
+};
 
-function redirect(url: string, opts = 302): CustomResponse<never>;
+function redirect(url: string, init?: number | RouterResponseInit): CustomResponse<never>;
 ``` 
 
-The `ResponseOptions` extens the types from the native [`ResponseInit`](https://developer.mozilla.org/en-US/docs/Web/API/Response/Response#options) interface.
+The `ResponseOptions` extends the types from the native [`ResponseInit`](https://developer.mozilla.org/en-US/docs/Web/API/Response/Response#options) interface.