doc: fix broken fs.BigIntStats link in vfs.md

fs.md describes the bigint variant inside the fs.Stats section and has
no separate fs.BigIntStats section to link to.

Signed-off-by: greenhead <shren0812@gmail.com>
PR-URL: #65045
Reviewed-By: Daeyeon Jeong <daeyeon.dev@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

Author: greenheadHQ

doc/api/vfs.md

@@ -320,6 +320,6 @@ fields use synthetic but stable values:
 [`RealFSProvider`]: #class-realfsprovider
 [`VirtualFileSystem`]: #class-virtualfilesystem
 [`VirtualProvider`]: #class-virtualprovider
-[`fs.BigIntStats`]: fs.md#class-fsbigintstats
+[`fs.BigIntStats`]: fs.md#class-fsstats
 [`fs.Stats`]: fs.md#class-fsstats
 [`node:fs`]: fs.md