The open source OpenXR runtime

doc: Document !1828

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doc/changes/auxiliary/mr.1809.4.md
··· 1 + --- 2 + - mr.1809 3 + - mr.1828 4 + --- 5 + 1 6 pacing: Add minimum application frame time.
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doc/changes/auxiliary/mr.1828.1.md
··· 1 + u/pacing: Add variable tracking integration to app pacer.
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doc/changes/auxiliary/mr.1828.2.md
··· 1 + u/pacing: Add env variable to set present to display offset.