doc: Adds release date.

Signed-off-on-by: Joel Davidow <[email protected]>

Author: solmagd

doc/releases/reef.rst

@@ -21,6 +21,11 @@ may encounter crashes during `pthread_create`. For workarounds, refer to the rel
 upgrading your OS to avoid this unsupported combination.
 Related tracker: https://tracker.ceph.com/issues/66989
 
+Release Date
+------------
+
+July 24, 2024
+
 Notable Changes
 ---------------
 
@@ -445,6 +450,11 @@ v18.2.2 Reef
 
 This is a hotfix release that resolves several flaws including Prometheus crashes and an encoder fix.
 
+Release Date
+------------
+
+March 11, 2024
+
 Notable Changes
 ---------------
 
@@ -463,6 +473,11 @@ v18.2.1 Reef
 This is the first backport release in the Reef series, and the first with Debian packages,
 for Debian Bookworm. We recommend that all users update to this release.
 
+Release Date
+------------
+
+December 18, 2023
+
 Notable Changes
 ---------------
 
@@ -963,6 +978,11 @@ This is the first stable release of Ceph Reef.
 
    *last updated 2023 Aug 04*
 
+Release Date
+------------
+
+August 7, 2023
+
 Major Changes from Quincy
 --------------------------