📋 standard metadata updates

[mairaw]

Related to #5062

We should merge #5099 first and then see how that with these changes combined look like. But wanted to keep that global change on a separate PR.

[pkulikov]

@mairaw sometimes I've seen ms.assetid being removed from the metadata as well. Whenever I touch metadata, should I keep it or might be removed as well? For example, in #5057 it's removed, but not here.

[mairaw]

Good question @pkulikov. I've been removing them from content that was created directly on Docs like Core or F#. But I'm keeping that metadata for folders that contain migrated content since that's the key to find the topic in our old system. We should be able to remove them entirely once we address all migration issues. /cc @rpetrusha @BillWagner

[pkulikov]

@mairaw thank you for the answer, that's clear. So, it's kind of pre-history for those docs in C# and standard folders.

[rpetrusha]

I've just spot-checked a random assortment of files, and everything seemed to be good, @mairaw. You can merge this when you're ready.