Update IfcFontWeight.md

[KnutHelland]

bold is not an allowed value according to WHERE-rule WR1.

[aothms]

How about updating the rule. I noticed small-caps is in the rule, which is not a weight, but a variant.

SVG (didn't check version) that we claim to be reference suggests: normal | bold | bolder | lighter | [<number>].

https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute/font-weight

My preference would be to strictly follow SVG.

[KnutHelland]

@aothms I don't know the process here. I hoped that it was possible to update the documentation for the already released IFC4X3_ADD2 schema. We can't change the schema, but I thought it was possible to correct wrong information in the documentation?

I agree that for future schema releases, it could be a good idea to change the where rule, but that should probably be a separate discussion, and should not slow down the process of just fixing this contradiction in the docs for the released schema. 🤔

[berlotti]

Good idea to fix inconsistencies between rule and documentation.
Next version we should change the rule.

[aothms]

Suggested change

	* normal
	* normal
	* small-caps [DEPRECATED]

If we want correspondence with the formal rule we need to add small-caps. But if you don't mind I'll add a deprecated label next to it (we don't have that formally since this is just a string.