Clarify documentation for *what* gets "automatically fired" when the do_mu_upgrade filter evaluates to true in Multisite.
See #26869. Built from https://develop.svn.wordpress.org/trunk@28376 git-svn-id: http://core.svn.wordpress.org/trunk@28204 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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@@ -50,8 +50,8 @@ if ( get_option('db_upgraded') ) {
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* Filter whether to attempt to perform the multisite DB upgrade routine.
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*
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* In single site, the user would be redirected to wp-admin/upgrade.php.
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* In multisite, it is automatically fired, but only when this filter
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* returns true.
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* In multisite, the DB upgrade routine is automatically fired, but only
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* when this filter returns true.
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*
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* If the network is 50 sites or less, it will run every time. Otherwise,
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* it will throttle itself to reduce load.
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