docs(examples): rename `hello.ts` to `[...hello].ts` (#5261)

Co-authored-by: pooya parsa <pyapar@gmail.com>

examples/composables/use-fetch/server/api/[...hello].ts

@@ -0,0 +1,4 @@
+export default defineEventHandler(event => ({
+  path: '/api/' + event.context.params.hello,
+  query: useQuery(event)
+}))

examples/composables/use-fetch/server/api/hello.ts

@@ -1,7 +0,0 @@
-import { useQuery } from 'h3'
-import { parseURL } from 'ufo'
-
-export default req => ({
-  path: '/api/hello' + parseURL(req.url).pathname,
-  query: useQuery(req)
-})