[Draft] add DisableSpfxTopBottomPlaceholdersElevated#1103

RongqiZ wants to merge 2 commits intoMicrosoftDocs:mainMicrosoftDocs/OfficeDocs-SharePoint-PowerShell:mainfrom

RongqiZ:user/rongqizhou/DisableSpfxTopBottomPlaceholdersElevatedRongqiZ/OfficeDocs-SharePoint-PowerShell:user/rongqizhou/DisableSpfxTopBottomPlaceholdersElevatedCopy head branch name to clipboard