docs: add faq section

Author: crwen

guide/src/SUMMARY.md

@@ -9,6 +9,7 @@
   - [JavaScript API](./usage/wasm.md)
   - [Advance](./usage/advance.md)
   - [Configuration](./usage/conf.md)
+  - [FAQ](./usage/faq.md)
 - [Examples](./examples/index.md)
   - [Using Tonbo](./examples/declare.md)
   - [Integrate with Datafusio](./examples/datafusion.md)

guide/src/usage/faq.md

@@ -0,0 +1,9 @@
+# FAQ
+
+## Failed to run custom build command for `ring` in macOS
+Apple Clang is a fork of Clang that is specialized to Apple's wishes. It doesn't support wasm32-unknown-unknown. You need to download and use llvm.org Clang instead. You can refer to this [issue](https://github.com/briansmith/ring/issues/1824) for more information.
+
+```bash
+brew install llvm
+echo 'export PATH="/opt/homebrew/opt/llvm/bin:$PATH"' >> ~/.zshrc
+```