Improve formatting of the bindgen/default readme (microsoft#3045)

crates/libs/bindgen/default/readme.md

@@ -1,23 +1,28 @@
 These `.winmd` files provide the default metadata for the Windows API. This is used to
 generate the `windows` and `windows-sys` crates. To view the metadata, use a tool
-like [ILSpy](https://github.com/icsharpcode/ILSpy). 
+like [ILSpy](https://github.com/icsharpcode/ILSpy).
 
-## Windows.Win32.winmd
-- Source: https://www.nuget.org/packages/Microsoft.Windows.SDK.Win32Metadata/
-- Version: 58.0.18
+## `Windows.Win32.winmd`
 
-## Windows.Wdk.winmd
-- Source: https://www.nuget.org/packages/Microsoft.Windows.WDK.Win32Metadata/
-- Version: 0.10.7
+- Source: <https://www.nuget.org/packages/Microsoft.Windows.SDK.Win32Metadata/>
+- Version: `58.0.18`
 
-## Windows.winmd
-- Source: https://www.nuget.org/packages/Microsoft.Windows.SDK.Contracts
-- Version: 10.0.22621.2428
+## `Windows.Wdk.winmd`
+
+- Source: <https://www.nuget.org/packages/Microsoft.Windows.WDK.Win32Metadata/>
+- Version: `0.10.7`
+
+## `Windows.winmd`
+
+- Source: <https://www.nuget.org/packages/Microsoft.Windows.SDK.Contracts>
+- Version: `10.0.22621.2428`
 
 The `Windows.winmd` file was created by merging the .winmd files from the last nuget package as follows:
 
-```
+```sh
 mdmerge -o out -i . -n 1
 ```
 
+---
+
 As with everything else in this repo, the `.winmd` files in this folder are licensed via MIT or Apache-2.0.