Help: add some initial documentation for Swift support

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diff --git a/Help/release/dev/swift-support.rst b/Help/release/dev/swift-support.rst
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+Swift Language Support
+----------------------
+
+* Preliminary support for the Swift language with the :generator:`Ninja`
+  generator was added.  Use the :envvar:`SWIFTC` environment variable to
+  specify a compiler.
+
+* Support to emit an output file map was added to enable Swift compilation.
+
+* A target property :prop_tgt:`Swift_DEPENDENCIES_FILE` was added to targets to
+  indicate where to save the target swift dependencies file.  If one is not
+  specified, it will default to `<TARGET>.swiftdeps`.
+
+* A target property :prop_tgt:`Swift_MODULE_NAME` was added to targets to
+  indicate the Swift module name.  If it is not specified, it will default to
+  the name of the target.
+
+* A source property :prop_sf:`Swift_DEPENDENCIES_FILE` was added to sources to
+  indicate where to save the target swift dependencies file.  If one is not
+  specified, it will default to `<OBJECT>.swiftdeps`.
+
+* A source property :prop_sf:`Swift_DIAGNOSTICS_FILE` was added to sources to
+  indicate where to write the serialised Swift diagnostics.