Update database-transactions.md

"How Model-driven Apps use transactions"

Under Forms (Retrieve):
Removed first bullet: Takes a read lock on the record shown
Replaced second bullet: More likely to have conflicts. An update lock will block anything else updating that record.

Under "Update":
Added a new bullet: In some rare cases, an update lock can block a read lock. One example of where this can occur is when Dataverse metadata is being changed: reads done by a Dataverse metadata change transaction will be blocked by update locks.

Author: pnghub

powerapps-docs/developer/data-platform/scalable-customization-design/database-transactions.md

@@ -95,9 +95,9 @@ Before understanding how customizations interact with the platform, it is useful
 
 |Operation|Description|
 |--|--|
-|Forms (Retrieve)|&bull; Takes a read lock on the record shown.<br />&bull; Low impact on other uses.|
+|Forms (Retrieve)|&bull; More likely to have conflicts. An update lock will block anything else updating that record.|
 |Create|&bull; Performs a create request through the platform<br />&bull; Low impact on other activities, as a new record nothing else blocking on it<br />&bull; Can potentially block locking queries to the whole table until it is complete.<br />&bull; Often can trigger related actions in customization which can have an impact.|
-|Update|&bull; Performs an update request through the platform.<br />&bull; More likely to have conflicts. An update lock will block anything else updating or reading that record. Also blocks anything taking a broad read lock on that table.<br />&bull; Often triggers other activities.|
+|Update|&bull; Performs an update request through the platform.<br />&bull; More likely to have conflicts. An update lock will block anything else updating or reading that record. Also blocks anything taking a broad read lock on that table.<br />&bull; Often triggers other activities.<br />&bull; In some rare cases, an update lock can block a read lock. One example of where this can occur is when Dataverse metadata is being changed: Reads done by a Dataverse metadata change transaction will be blocked by update locks.|
 |View (RetrieveMultiple)|&bull; Would think this would block lots of other activity.<br />&bull; Although poor query optimization can affect DB resource usage and possibly hit timeouts.|
 
 ## Event pipeline: platform step