[update] Try to keep existing order for type and member signatures.

[rolfbjarne]

This avoids a lot of unnecessary churn in the diff when updating docs.

[rolfbjarne]

@huangmin-ms I see you changed the target branch, do I need to do anything?

[huangmin-ms]

@rolfbjarne Not for now. I need to take a closer look at this PR and will let you know then. The process is to first merge develop and then develop to main.