doc: remove legacy in-page links in v8.md

Use autogenerated id attributes.

PR-URL: #41291
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: James M Snell <jasnell@gmail.com>

doc/api/v8.md

@@ -825,9 +825,9 @@ Called when the promise receives a resolution or rejection value. This may
 occur synchronously in the case of `Promise.resolve()` or `Promise.reject()`.
 
 [HTML structured clone algorithm]: https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API/Structured_clone_algorithm
-[Hook Callbacks]: #hook_callbacks
+[Hook Callbacks]: #hook-callbacks
 [V8]: https://developers.google.com/v8/
-[`AsyncLocalStorage`]: async_context.md#class_asynclocalstorage
+[`AsyncLocalStorage`]: async_context.md#class-asynclocalstorage
 [`Buffer`]: buffer.md
 [`DefaultDeserializer`]: #class-v8defaultdeserializer
 [`DefaultSerializer`]: #class-v8defaultserializer
@@ -837,20 +837,20 @@ occur synchronously in the case of `Promise.resolve()` or `Promise.reject()`.
 [`GetHeapSpaceStatistics`]: https://v8docs.nodesource.com/node-13.2/d5/dda/classv8_1_1_isolate.html#ac673576f24fdc7a33378f8f57e1d13a4
 [`NODE_V8_COVERAGE`]: cli.md#node_v8_coveragedir
 [`Serializer`]: #class-v8serializer
-[`after` callback]: #after_promise
+[`after` callback]: #afterpromise
 [`async_hooks`]: async_hooks.md
-[`before` callback]: #before_promise
+[`before` callback]: #beforepromise
 [`buffer.constants.MAX_LENGTH`]: buffer.md#bufferconstantsmax_length
 [`deserializer._readHostObject()`]: #deserializer_readhostobject
 [`deserializer.transferArrayBuffer()`]: #deserializertransferarraybufferid-arraybuffer
-[`init` callback]: #init_promise_parent
+[`init` callback]: #initpromise-parent
 [`serialize()`]: #v8serializevalue
 [`serializer._getSharedArrayBufferId()`]: #serializer_getsharedarraybufferidsharedarraybuffer
 [`serializer._writeHostObject()`]: #serializer_writehostobjectobject
 [`serializer.releaseBuffer()`]: #serializerreleasebuffer
 [`serializer.transferArrayBuffer()`]: #serializertransferarraybufferid-arraybuffer
 [`serializer.writeRawBytes()`]: #serializerwriterawbytesbuffer
-[`settled` callback]: #settled_promise
+[`settled` callback]: #settledpromise
 [`v8.stopCoverage()`]: #v8stopcoverage
 [`v8.takeCoverage()`]: #v8takecoverage
 [`vm.Script`]: vm.md#new-vmscriptcode-options