Wrong links under 'related commands'

[clovergaze]

Describe the bug
On the API page for hashMap the related command array points to the hashMap page again.

On the API page for forEach all related commands (next, toList, close (result)) point to the forEach page. Also, there is an inconsistency here, the document name does not correlate with the name of the Java command.

On the API page for toJsonString the related command json points to the toJsonString page again.

To Reproduce
Steps to reproduce the behavior:

1. Go to the corresponding pages (see links above)
2. Check the links under 'Related commands' at the bottom of the page

Expected behavior
Link to the correct page of the listed command.

[srh]

Also on the insertAt page, as reported by Discord user "forbidden era".

[ForbiddenEra]

This is also an issue on some other pages; I noticed on insertAt; for the links to spliceAt, deleteAt, changeAt