v8.72.2

ModelingToolkit v8.72.2

Diff since v8.72.1

Merged pull requests:

• update docs for new extension syntax (#2309) (@ChrisRackauckas)
• Simplify at extend (#2310) (@YingboMa)

Closed issues:

• Alias @named to @build to avoid confusion (#2263)
• @variables error with description and default value depending on parameters (#2298)