doc: release note for asm repr script changes

doc/release-notes/28824.md

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+Notable changes
+===============
+
+Updated RPCs
+------------
+
+* Script decoding behaviour in various RPCs has been updated.
+  Previously, the `asm` representations silently displayed pushed values of 4 bytes or fewer in decimal encoding, while representing values larger than 4 bytes in little endian hexadecimal.
+  This inconsistent behaviour, which was not documented, led to confusion when interpreting various values.
+
+  The following changes have been implemented:
+
+    * Drop "OP_" prefix from all opcodes
+      * OP_n -> n (so -1, 0, 1, ..., 10, ..., 16)
+    * For minimal pushes:
+        * \<= 5 bytes using decimal
+        * \> 5 bytes using big endian hex enclosed in angle brackets <...>
+    * For non-minimal pushes
+        * prefix the big endian hex with the push opcode and enclose in angle brackets OP_CODE<...>
+
+  These changes will affect the `asm` output of the `getrawtransaction`, `decodetransaction`, `decodescript` and `decodepsbt` RPCs.
+  See #7996 and #27795 for more discussion.
+