message: Fix "since" versions in 5.23.1 section
diff: * Fixed the metrics throwing an exception when a query cannot be serialised. Now it reports the exception message as the description.
  ([#3031](https://github.com/realm/realm-sync/issues/3031), since v3.2.0)
  * Queries involving an indexed int column which were constrained by a LinkList with an order different from the table's order would
  - give incorrect results. ([#3307](https://github.com/realm/realm-core/issues/3307), since v3.19.0)
  -* Queries involving an indexed int column had a memory leak if run multiple times. ([#6186](https://github.com/realm/realm-cocoa/issues/6186)), since v3.19.0)
  + give incorrect results. ([#3307](https://github.com/realm/realm-core/issues/3307), since v5.19.0)
  +* Queries involving an indexed int column had a memory leak if run multiple times. ([#6186](https://github.com/realm/realm-cocoa/issues/6186)), since v5.19.0)
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