Auto merge of #23715 - paulrouget:docup, r=jdm

Update hololens doc

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How to compile and run:
With Visual Studio **2019**:
- Open `support/hololens/ServoApp.sln`
- click on *restore nugets packages* under the context menu of "Solution" (in the right panel). This will automatically download Angle which comes with libEGL.dll, necessary to build servo.
In your Visual Studio **2017** cmd prompt:
- make sure libEGL.dll is in your `%LIB%` path: `set LIB=%LIB%;c:\XXX\servo\support\hololens\packages\ANGLE.WindowsStore.2.1.13\bin\UAP\x64\`
In your Visual Studio 2017 cmd prompt:
- compile servo: `mach build -d --uwp`
With Visual Studio **2019**:
Install [HoloLens 2 Emulator](https://docs.microsoft.com/en-us/windows/mixed-reality/using-the-hololens-emulator).
With Visual Studio 2017:
- Open `support\hololens\ServoApp.sln`
- Select emulator or local machine, select configuration (Debug or Release) and press run
- VS will look for the DLLs and .h in `../../target/debug|release/` (depending on the configuration you selected in VS) and copy them in the final package.