chore: remove example with no content references

fetch/README.md

@@ -12,5 +12,4 @@ See below for links to the live versions of each example:
 - [Basic Fetch example with returned Response properties](https://mdn.github.io/dom-examples/fetch/fetch-response/)
 - [Fetch cloned Response example](https://mdn.github.io/dom-examples/fetch/fetch-response-clone/)
 - [Fetch text example](https://mdn.github.io/dom-examples/fetch/fetch-text/)
-- [Fetch example with Request object and Init object](https://mdn.github.io/dom-examples/fetch/fetch-with-init-then-request/)
 - [object-fit gallery with fetched images](https://mdn.github.io/dom-examples/fetch/object-fit-gallery-fetch/)