[w3c/manifest] Extension of the Application Manifest -> MiniApps Manifest (#974)

Hi team,

As co-editor of the [MiniApp Manifest spec](https://w3c.github.io/miniapp-manifest/), before moving ahead to the FPWG, I would like to align with you in the process to create homogeneous specifications. 

The current MiniApps Manifest specification includes references to the [Application Manifest members](https://w3c.github.io/miniapp-manifest/#webappmanifest-members) and defines some [supplementary ones](https://w3c.github.io/miniapp-manifest/#supplementary-manifest-members). Following the extensibility recommendations, we have defined the algorithms to process these MiniApp members, using the manifest [extension point](https://www.w3.org/TR/appmanifest/#dfn-extension-point).

We have indicated this in the [Processing the manifest](https://w3c.github.io/miniapp-manifest/#processing) section. **I wonder if [this way](https://w3c.github.io/miniapp-manifest/#processing) is correct, or we should also indicate it formally using Infra.** 

Thanks in advance.

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