Fix broken links

Author: juntyr

src/doc/rustc/src/platform-support/wasm32-unknown-emscripten.md

@@ -11,17 +11,17 @@ This target is often used when compiling for the web, accessing web APIs, or
 interoperating with C and C++ code.
 
 One existing user of this target is the
-[`pyodide` project](https://github.com/pyodide/pyodide) which provides a Python
-runtime in WebAssembly using Emscripten and compiles Python extension modules
-written in Rust to the `wasm32-unknown-emscripten` target.
+[`pyodide` project](https://pyodide.org/) which provides a Python runtime in
+WebAssembly using Emscripten and compiles Python extension modules written in Rust
+to the `wasm32-unknown-emscripten` target.
 
 If you want to target the web but no not need interop with C/C++ or you want to
 produce a bare-bones WebAssembly binary and you do not require access to the host
 environment (e.g. stdio, file access, networking, etc.), consider using the
-[`wasm32-unknown-unknown`](./wasm32-unknown-unknown) target instead.
+[`wasm32-unknown-unknown`](./wasm32-unknown-unknown.md) target instead.
 
 If you need access to the host environment, consider using one of the WASI targets
-([`wasm32-wasip1`](./wasm32-wasip1) or [`wasm32-wasip2`](./wasm32-wasip2)).
+([`wasm32-wasip1`](./wasm32-wasip1.md) or [`wasm32-wasip2`](./wasm32-wasip2.md)).
 
 ## Target maintainers
 
@@ -38,7 +38,7 @@ said, those interested in maintaining this target are:
 
 This target is cross-compiled. The Emscripten compiler toolchain (emsdk) must be
 installed to link Rust-compiled code with Emscripten's libc and other C/C++
-code. Please refer to https://emscripten.org/docs/getting_started/downloads.html
+code. Please refer to <https://emscripten.org/docs/getting_started/downloads.html>
 on how to get started with the emsdk.
 
 ## Building the target
@@ -88,8 +88,8 @@ $ cargo +nightly -Zbuild-std build
 ## Testing
 
 This target is not extensively tested in CI for the rust-lang/rust repository.
-It's recommended to test the `wasm32-wasip1` target instead for WebAssembly
-compatibility.
+It's recommended to test the [`wasm32-wasip1`](./wasm32-wasip1.md) target instead
+for WebAssembly compatibility.
 
 ## Conditionally compiling code