chore: update pdc docs

[Timongcraft]

• Refactor examples to use ItemStack instead of ItemMeta
• Cleanup for PDC docs

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[Strokkur424]

In general I think you could provide more JavaDoc links here and there

[Timongcraft]

In general I think you could provide more JavaDoc links here and there

As I see it the docs only link to stuff one timer per document and I think that is fine

[Timongcraft]

ahhh, you can't use double underline?

[zlataovce]

this should be just an aside

Suggested change

## Read-only containers

[Timongcraft]

No, because then it wouldn't be in the sidebar

[zlataovce]

if it's supposed to be a full-fledged section, it should elaborate on the purpose and benefit of accessing a view instead of a mutable version in general, not just a single note that duplicates information from the "Storing on different objects" section

[Timongcraft]

it should elaborate on the purpose and benefit of accessing a view instead of a mutable version in general
What should I elaborate on (other than not accidentally modifying the data)?
Also there's no "benefit", it is just that you can't get a normal container from e.g. an OfflinePlayer.

[zlataovce]

well currently the purpose of the view is to side-step technical limitations, like the ItemMeta snapshot costliness or the file I/O intensity of having a mutable offline player PDC, which is pretty noteworthy

[Timongcraft]

Alright, is this good then?