Combine table and index attributes in Rust example

[kistz]

Description of Changes

The syntax is not supported like shows and must be included in the table macro.

API and ABI breaking changes

None.

Expected complexity level and risk

0 No runtime change

Testing

• Code compiles now.

[cloutiertyler]

Is there any more context on this change?

[kistz]

@cloutiertyler yes. index being a separate macro invocation is not supported. it must be inside the table macro. i assume this is because you can have multiple tables per struct definition so the separate index would be ambigous. :>

Example that it doesnt work: (error is that index is not found in spacetimedb)

[egormanga]

It would actually be more reasonable to support this syntax instead.

[kistz]

I dont necessarily think so because of the ambiguity mentioned above but thats a separate discussion anyway.
IMO it is worth fixing mistakes in docs immediately since it increases friction for new users and you can always add the syntax back at a later stage.
However i dont feel strongly about this pr so feel free to close. just thought this was faster than creating a issue for it :>

[bfops]

This seems like a straightforward docs fix to me, approving.

Thank you for this!