Merge pull request bjorn3#83 from oligamiq/repair_small_mistake

Fix typo in .gitmodules and update README.md with browser compatibility notes

Author: bjorn3

.gitmodules

@@ -8,4 +8,4 @@
 [submodule "threads/examples/wasi_multi_threads_rustc/rust_wasm"]
 	path = threads/examples/wasi_multi_threads_rustc/rust_wasm
 	url = https://github.com/oligamiq/rust_wasm
-	sharrow = true
+	shallow = true

threads/README.md

@@ -2,6 +2,10 @@
 
 > [!WARNING]
 > The code in this directory is less production ready than the main browser_wasi_shim code.
+> This code requires `SharedArrayBuffer`, `waitAsync` and `Atomics` to be enabled in the browser, so it may not work in all browsers.
+> For example, Firefox failed to run the demo in this directory.
+> Chrome worked fine.
+> This library require `cross-origin isolation` to be enabled in the browser.
 
 This project implement threads on browser_wasi_shim