add missing release notes docs

Author: Ethan-Arrowood

site/versioned_docs/version-4.6/technical-details/release-notes/v4-tucker/4.5.15.md

@@ -0,0 +1,10 @@
+---
+title: 4.5.15
+sidebar_position: 59484
+---
+
+### HarperDB 4.5.15
+7/21/2025
+
+- Removed the `copyTablesToCatchUp` option and instead utilized the clone node designation of the leader node to copy tables
+- Ensure that skipping large number of audit entries does not lock up the thread and cause a connection reset

site/versioned_docs/version-4.6/technical-details/release-notes/v4-tucker/4.5.16.md

@@ -0,0 +1,9 @@
+---
+title: 4.5.16
+sidebar_position: 59483
+---
+
+### HarperDB 4.5.16
+7/30/2025
+
+- Do not free/remove the shared user buffer that is used by all threads as an atomic counter for ids (for blobs and incremented ids), but retain it as a stable allocated buffer 

site/versioned_docs/version-4.6/technical-details/release-notes/v4-tucker/4.6.3.md

@@ -0,0 +1,12 @@
+---
+title: 4.6.3
+sidebar_position: 59396
+---
+
+# 4.6.3
+7/30/2025
+
+- Fix for calling table.operation()
+- Do not free/remove the shared user buffer that is used by all threads as an atomic counter for ids (for blobs and incremented ids), but retain it as a stable allocated buffer
+- Removed the `copyTablesToCatchUp` option and instead utilized the clone node designation of the leader node to copy tables
+- Ensure that skipping large number of audit entries does not lock up the thread and cause a connection reset