Mention add_column_with_default in downtime guide
What does this MR do?
This extends the "What causes downtime" guide with a mention of the add_column_with_default
migration helper.
Are there points in the code the reviewer needs to double check?
Spelling, grammar, etc.
Why was this MR needed?
Currently the guide may lead one to believe it's not possible at all to add a column with a default value.
Does this MR meet the acceptance criteria?
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CHANGELOG entry added -
Documentation created/updated - Tests
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All builds are passing
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Conform by the style guides -
Branch has no merge conflicts with master
(if you do - rebase it please) -
Squashed related commits together