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Clarify that we mark as outliers because we don't have any state for them (#12345) 

As discussed at https://github.com/matrix-org/synapse/pull/12179#discussion_r837263852
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Eric Eastwood 2022-04-06 16:34:33 -05:00 committed by GitHub
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Updates to the Room DAG concepts development document to clarify that we mark events as outliers because we don't have any state for them.

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docs/development/room-dag-concepts.md
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@ -39,7 +39,8 @@ yet correlated to the DAG.
Outliers typically arise when we fetch the auth chain or state for a given Outliers typically arise when we fetch the auth chain or state for a given
event. When that happens, we just grab the events in the state/auth chain, event. When that happens, we just grab the events in the state/auth chain,
without calculating the state at those events, or backfilling their without calculating the state at those events, or backfilling their
`prev_events`. `prev_events`. Since we don't have the state at any events fetched in that
way, we mark them as outliers.
So, typically, we won't have the `prev_events` of an `outlier` in the database, So, typically, we won't have the `prev_events` of an `outlier` in the database,
(though it's entirely possible that we *might* have them for some other (though it's entirely possible that we *might* have them for some other