[lldb][docs] Add WASM support issue link to website

Author: DavidSpickett

lldb/docs/index.rst

@@ -86,6 +86,7 @@ current state, follow the links to their respective issues:
 
 * `RISC-V <https://github.com/llvm/llvm-project/issues/55383>`_
 * `LoongArch <https://github.com/llvm/llvm-project/issues/112693>`_
+* `WebAssembly <https://github.com/llvm/llvm-project/issues/150449`_
 
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