Clarify using directive examples #43580
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Fixes #43136: Using directives can appear in namespace declarations, unless it's a global using.
Fixes #29746: Add notes about how to get diagnostics on duplicated global usings, and considering a standard location for all global usings in a project.
Fixes #27331: Rework a couple sentences for clarity.
Fixes #26469: Add text an examples for the
::
token for qualified namespace aliases.Internal previews