[PATCH v7 3/4] doc: update release notes for PTP protocol library

[Rajesh Kumar <rajesh3.kumar@intel.com>]

Update release notes with IEEE 1588 PTP additions:
  - PTP protocol definitions in lib/net/rte_ptp.h (header-only library
    with inline helpers and wire-format structures)
  - PTP software relay example application (ptp_tap_relay_sw)

Signed-off-by: Rajesh Kumar <rajesh3.kumar@intel.com>
---
 doc/guides/rel_notes/release_26_07.rst | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/doc/guides/rel_notes/release_26_07.rst b/doc/guides/rel_notes/release_26_07.rst
index f012d47a4b..c64e6e141b 100644
--- a/doc/guides/rel_notes/release_26_07.rst
+++ b/doc/guides/rel_notes/release_26_07.rst
@@ -63,6 +63,18 @@ New Features
     ``rte_eal_init`` and the application is responsible for probing each device,
   * ``--auto-probing`` enables the initial bus probing, which is the current default behavior.
 
+* **Added PTP protocol definitions (rte_ptp.h).**
+
+  Added IEEE 1588 Precision Time Protocol header structures, constants,
+  and inline helpers to ``lib/net/rte_ptp.h``.  Provides wire-format
+  structures with endian-annotated types and correctionField manipulation
+  for Transparent Clock implementations.
+
+* **Added PTP software relay example application.**
+
+  Added a new example application ``ptp_tap_relay_sw`` demonstrating a
+  software PTP Transparent Clock relay between a DPDK port and a kernel
+  TAP interface.
 
 Removed Items
 -------------
-- 
2.53.0