docs: Update 404 devtools extension documentation link (electron#48813)

* docs: Update 404 devtools extension documentation link

https://developer.chrome.com/extensions/devtools

↑Current link is not exists.

So update to most relevant developer.chrome.com page.

https://developer.chrome.com/docs/extensions/how-to/devtools/extend-devtools#creating

* docs: remove unnecessary anchor link

Co-authored-by: Erick Zhao <erick@hotmail.ca>

---------

Co-authored-by: Erick Zhao <erick@hotmail.ca>

Author: ryota-murakami

docs/tutorial/devtools-extension.md

@@ -94,7 +94,7 @@ If the extension works on Chrome but not on Electron, file a bug in Electron's
 [issue tracker][issue-tracker] and describe which part
 of the extension is not working as expected.
 
-[devtools-extension]: https://developer.chrome.com/extensions/devtools
+[devtools-extension]: https://developer.chrome.com/docs/extensions/how-to/devtools/extend-devtools
 [session]: ../api/session.md
 [react-devtools]: https://chrome.google.com/webstore/detail/react-developer-tools/fmkadmapgofadopljbjfkapdkoienihi
 [load-extension]: ../api/extensions-api.md#extensionsloadextensionpath-options