Add Trino 463 release notes

docs/src/main/sphinx/release.md

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 ```{toctree}
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+release/release-463
 release/release-462
 release/release-461
 release/release-460

docs/src/main/sphinx/release/release-463.md

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+# Release 463 (23 Oct 2024)
+
+## General
+
+* Enable HTTP/2 for internal communication by default. The previous behavior can
+  be restored by setting `internal-communication.http2.enabled` to `false`. ({issue}`21793`)
+* Add {func}`timezone` functions to extract the timezone identifier from from a
+  `timestamp(p) with time zone` or `time(p) with time zone`. ({issue}`20893`)
+* Include table functions with `SHOW FUNCTIONS` output. ({issue}`12550`)
+* Print peak memory usage in `EXPLAIN ANALYZE` output. ({issue}`23874`)
+* Disallow the window framing clause for {func}`ntile`, {func}`rank`,
+  {func}`dense_rank`, {func}`percent_rank`,  {func}`cume_dist`, and
+  {func}`row_number`. ({issue}`23742`)
+
+## ClickHouse connector
+
+* Improve performance for queries with `IS NULL` expressions. ({issue}`23459`)
+
+## Delta Lake connector
+
+* Add support for writing change data feed when [deletion vector](https://docs.delta.io/latest/delta-deletion-vectors.html) 
+  is enabled. ({issue}`23620`)
+
+## Iceberg connector
+
+* Add support for nested namespaces with the REST catalog. ({issue}`22916`)
+* Add support for configuring the maximum number of rows per row-group in the
+  ORC writer with the `orc_writer_max_row_group_rows` catalog session property. ({issue}`23722`)
+* Clean up position delete files when `OPTIMIZE` is run on a subset of the
+  table's partitions. ({issue}`23801`)
+* Rename `iceberg.add_files-procedure.enabled` catalog configuration property to
+  `iceberg.add-files-procedure.enabled`. ({issue}`23873`)
+
+## SingleStore connector
+
+* Fix incorrect column length of `varchar` type in SingleStore version 8. ({issue}`23780`)