Promote `%m is Map` syntax more
Promote `%m is Map` syntax more

Mention the `%m is Map` syntax on the `Map` documentation page.
Previously the syntax was only mentioned on the `Syntax` page.

tbrowder/doc,tbrowder/doc,tbrowder/doc,MasterDuke17/doc,MasterDuke17/doc,tbrowder/doc,MasterDuke17/doc,MasterDuke17/doc