Add note on embedded DWARF sections

See #148.

Debugging.md

@@ -6,9 +6,14 @@ It is a goal to support DWARF in WebAssembly, see
 [the proposed additions to DWARF](https://yurydelendik.github.io/webassembly-dwarf/)
 for how that is planned to work.
 
+## Embedded DWARF
+
+The proposal allows [embedding the DWARF sections](https://yurydelendik.github.io/webassembly-dwarf/#embedding-DWARF)
+as WebAssembly custom sections with the same name (`.debug_*`) and raw data as in the DWARF spec.
+
 ## External DWARF
 
-That proposal allows keeping the DWARF information
+The proposal also allows keeping the DWARF information
 [external to the Wasm](https://yurydelendik.github.io/webassembly-dwarf/#external-DWARF).
 When doing so, the main Wasm file does not need to contain any debug info, and
 instead has a custom section with the name `external_debug_info`. That section