docs(typo): fix redundant double spaces (#71137)

## 📚 Improving Documentation

Hello, I've fixed redundant double spaces in
`docs/02-app/02-api-reference/02-file-conventions/loading.mdx` and
`docs/02-app/02-api-reference/02-file-conventions/route.mdx`.

Co-authored-by: JJ Kasper <jj@jjsweb.site>

docs/02-app/02-api-reference/02-file-conventions/loading.mdx

@@ -1,6 +1,6 @@
 ---
 title: loading.js
-description: API reference for the loading.js  file.
+description: API reference for the loading.js file.
 ---
 
 A **loading** file can create instant loading states built on [Suspense](/docs/app/building-your-application/routing/loading-ui-and-streaming).

docs/02-app/02-api-reference/02-file-conventions/route.mdx

@@ -22,7 +22,7 @@ export async function DELETE(request: Request) {}
 
 export async function PATCH(request: Request) {}
 
-// If `OPTIONS` is not defined, Next.js will automatically implement `OPTIONS` and  set the appropriate Response `Allow` header depending on the other methods defined in the route handler.
+// If `OPTIONS` is not defined, Next.js will automatically implement `OPTIONS` and set the appropriate Response `Allow` header depending on the other methods defined in the route handler.
 export async function OPTIONS(request: Request) {}
 ```
 
@@ -39,7 +39,7 @@ export async function DELETE(request) {}
 
 export async function PATCH(request) {}
 
-// If `OPTIONS` is not defined, Next.js will automatically implement `OPTIONS` and  set the appropriate Response `Allow` header depending on the other methods defined in the route handler.
+// If `OPTIONS` is not defined, Next.js will automatically implement `OPTIONS` and set the appropriate Response `Allow` header depending on the other methods defined in the route handler.
 export async function OPTIONS(request) {}
 ```