Normalize 11.0 preview sections in package version changes #23138
BackRelated to #23137
Merge 11.0.0-preview into 11.0.0-rc.1 and rename 10.8.0-preview to 10.8.0-rc.1. The older sections come from the rel-10.7 forward merge.
Related to #23137
Merge 11.0.0-preview into 11.0.0-rc.1 and rename 10.8.0-preview to 10.8.0-rc.1. The older sections come from the rel-10.7 forward merge.