Fix documentation regarding anchor links

[bjoernmartin]

Working with vitepress v1.3.3, I noticed a link in the format ./#heading does not work / leads to a docs generation error, whereas #heading works for me. Hence this PR.

Description

Linked Issues

Additional Context

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[brc-dd]

read the sentence again, it's to go to foo/index.md#heading from foo/one.md

what you've written is how you jump to different header within the same file

[bjoernmartin]

It still fixed working with Vitepress for me, so no idea how your explanation invalidates that. But who am I to force you accepting help?

[brc-dd]

That section reads:

For example, given the following directory structure:

```
.
├─ index.md
├─ foo
│  ├─ index.md
│  ├─ one.md
│  └─ two.md
└─ bar
   ├─ index.md
   ├─ three.md
   └─ four.md
```

And providing you are in `foo/one.md`:

...

[foo heading](./#heading) <!-- anchors user to a heading in the foo index file -->

So, if you make it

[foo heading](#heading)

It will go to /foo/one.html#heading not /foo/#heading

The original version might have caused issue for you because you might not have a foo/index.md in first place. So, trying to link to it rightfully threw dead link found error.