fixed version in link

src/current/_includes/releases/v23.1/v23.1.21.md

@@ -31,7 +31,7 @@ Release Date: May 7, 2024
 
 <h3 id="v23-1-21-performance-improvements">Performance improvements</h3>
 
-- More efficient [query plans]({% link v23.1/cost-based-optimizer.md %}) are now generated for queries with text similarity filters, for example, `text_col % 'foobar'`. These plans are generated if the `optimizer_use_trigram_similarity_optimization` [session setting]({% link v24.1/set-vars.md %}) is enabled. It is disabled by default. [#122683][#122683]
+- More efficient [query plans]({% link v23.1/cost-based-optimizer.md %}) are now generated for queries with text similarity filters, for example, `text_col % 'foobar'`. These plans are generated if the `optimizer_use_trigram_similarity_optimization` [session setting]({% link v23.1/set-vars.md %}) is enabled. It is disabled by default. [#122683][#122683]
 - Added a new [session variable]({% link v23.1/set-vars.md %}) `optimizer_use_improved_zigzag_join_costing`. When enabled, the cost of [zigzag joins]({% link v23.1/cost-based-optimizer.md %}#zigzag-joins) is updated so zigzag joins will only be chosen over scans if the zigzag joins produce fewer rows. This change only applies if the session variable `enable_zigzag_join` is also `on`. [#123068][#123068]
 - Improved the selectivity estimation of multi-column filters by the [optimizer]({% link v23.1/cost-based-optimizer.md %}) when the multi-column distinct count is high. This avoids cases where CockroachDB significantly over-estimates the selectivity of a multi-column predicate and as a result can prevent the optimizer from choosing a bad query plan. [#123068][#123068]