Document button values in the RemoteDesktop api

I spent some time trying to pass X11 button values
and was a bit miffed that it didn't work. So lets
document the expected values to minimize future
frustation.
13 jobs for !1848 with document-button-values in 21 minutes and 28 seconds (queued for 2 seconds)
latest detached
Status Job ID Name Coverage
  Review
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check-commit-log

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check-merge-request

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  Prepare
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build-fedora-container@aarch64

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build-fedora-container@x86_64

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  Build
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build-mutter@aarch64

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build-mutter@x86_64

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build-without-native-backend-and-wayland@x86_64

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build-without-opengl-and-glx@x86_64

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  Test
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can-build-gnome-shell@x86_64

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test-mutter@aarch64

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test-mutter@x86_64

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  Coverage
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test-mutter-coverage@aarch64

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47.0%
passed #1277573
test-mutter-coverage@x86_64

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47.0%