Docs: Clarify which kinds of options actually support "random" (#2845)

* Clarify which kinds of options actually support "random"

The current phrasing of this sentence made me expect "random" to work even on my OptionsDict option. After asking `#archipelago-dev` and checking the `Options.py` code, it's become clear that many option types don't (and can't) support "random". This is my best guess at a more correct wording.

* add a sentence about from_text overrides based on black-silver's suggestion
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@ -24,8 +24,11 @@ display as `Value1` on the webhost.
(i.e. `alias_value_1 = option_value1`) which will allow users to use either `value_1` or `value1` in their yaml
files, and both will resolve as `value1`. This should be used when changing options around, i.e. changing a Toggle to a
Choice, and defining `alias_true = option_full`.
- All options support `random` as a generic option. `random` chooses from any of the available values for that option,
and is reserved by AP. You can set this as your default value, but you cannot define your own `option_random`.
- All options with a fixed set of possible values (i.e. those which inherit from `Toggle`, `(Text)Choice` or
`(Named/Special)Range`) support `random` as a generic option. `random` chooses from any of the available values for that
option, and is reserved by AP. You can set this as your default value, but you cannot define your own `option_random`.
However, you can override `from_text` and handle `text == "random"` to customize its behavior or
implement it for additional option types.
As an example, suppose we want an option that lets the user start their game with a sword in their inventory, an option
to let the player choose the difficulty, and an option to choose how much health the final boss has. Let's create our