Update names of emdawnwebgpu targets in documentation

- the emscripten target names seem outdated in documentation

Change-Id: I5525bf5d8bbeee13a87cd4adfe970d89194f9a5a
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/198558
Auto-Submit: Jaswant Panchumarti <jaswant.panchumarti@kitware.com>
Reviewed-by: Loko Kung <lokokung@google.com>
Commit-Queue: Jaswant Panchumarti <jaswant.panchumarti@kitware.com>
diff --git a/src/emdawnwebgpu/README.md b/src/emdawnwebgpu/README.md
index 00e8f84..70c6c40 100644
--- a/src/emdawnwebgpu/README.md
+++ b/src/emdawnwebgpu/README.md
@@ -34,7 +34,7 @@
 - Set up a Dawn GN build, with `dawn_emscripten_dir` in the GN args set to point to
   your Emscripten source checkout.
 
-- Build the `emscripten_webgpu` GN build target.
+- Build the `emdawnwebgpu` GN build target.
 
-- Configure the Emscripten build with all of the linker flags listed in `emscripten_webgpu_config`
+- Configure the Emscripten build with all of the linker flags listed in `emdawnwebgpu_config`
   (and without `-sUSE_WEBGPU`, because we don't want the built-in bindings).