wasm : add note about worker.js file generation [no ci] (#3133)

This commit updates the documentation for the WASM examples to include a
note about the generation of the `worker.js` file. As of Emscripten
3.1.58 (April 2024), separate worker.js files are no longer generated
and the worker is embedded in the main JS file.

The motivation for this change is to inform users about the new behavior
of Emscripten and why the `worker.js` file may not be present.

Refs: https://github.com/ggml-org/whisper.cpp/issues/3123

examples/bench.wasm/README.md

@@ -28,5 +28,10 @@ to the server's HTTP path:
 ```
 # copy the produced page to your HTTP path
 cp bin/bench.wasm/*       /path/to/html/
+cp bin/libbench.js        /path/to/html/
 cp bin/libbench.worker.js /path/to/html/
 ```
+
+> 📝 **Note:** As of Emscripten 3.1.58 (April 2024), separate worker.js files are no
+> longer generated and the worker is embedded in the main JS file. So the worker
+> file will not be geneated for versions later than `3.1.58`.

examples/command.wasm/README.md

@@ -28,5 +28,10 @@ To run the example in a different server, you need to copy the following files
 to the server's HTTP path:
 ```
 cp bin/command.wasm/*       /path/to/html/
+cp bin/libcommand.js        /path/to/html/
 cp bin/libcommand.worker.js /path/to/html/
 ```
+
+> 📝 **Note:** As of Emscripten 3.1.58 (April 2024), separate worker.js files are no
+> longer generated and the worker is embedded in the main JS file. So the worker
+> file will not be geneated for versions later than `3.1.58`.

examples/stream.wasm/README.md

@@ -26,5 +26,10 @@ to the server's HTTP path:
 ```
 # copy the produced page to your HTTP path
 cp bin/stream.wasm/*       /path/to/html/
+cp bin/libstream.js        /path/to/html/
 cp bin/libstream.worker.js /path/to/html/
 ```
+
+> 📝 **Note:** As of Emscripten 3.1.58 (April 2024), separate worker.js files are no
+> longer generated and the worker is embedded in the main JS file. So the worker
+> file will not be geneated for versions later than `3.1.58`.

examples/whisper.wasm/README.md

@@ -48,5 +48,10 @@ to the server's HTTP path:
 ```
 # copy the produced page to your HTTP path
 cp bin/whisper.wasm/*    /path/to/html/
+cp bin/libmain.js        /path/to/html/
 cp bin/libmain.worker.js /path/to/html/
 ```
+
+> 📝 **Note:** As of Emscripten 3.1.58 (April 2024), separate worker.js files are no
+> longer generated and the worker is embedded in the main JS file. So the worker
+> file will not be geneated for versions later than `3.1.58`.