Complex type promotion diagram disappears in the draft standard

[leofang]

In the 2021.12 standard it is here: https://data-apis.org/array-api/2021.12/API_specification/data_types.html#float64, which says it "will be added to Type Promotion Rules". But it disappears in both Data Types and Type Promotion Rules sections of the draft standard. I think it was a simple overlook when creating the versioned standards.

[leofang]

According to @kgryte the plan is to merge https://github.com/data-apis/array-api/blob/main/spec/_static/images/dtype_promotion_complex.png into https://github.com/data-apis/array-api/blob/main/spec/_static/images/dtype_promotion_lattice.png.