doc: releases: add some Arm entries to v3.7 notes

This adds a few noticeable entries for Arm architectures.

Signed-off-by: Wilfried Chauveau <[email protected]>

Author: ithinuel

doc/releases/release-notes-3.7.rst

@@ -215,10 +215,14 @@ Architectures
 
 * ARM
 
+  * Added initial support for Cortex-M85 Core
+
 * ARM64
 
   * Implemented symbol names in the backtraces, enable by selecting :kconfig:option:`CONFIG_SYMTAB`
 
+  * Add compiler tuning for Cortex-R82
+
 * RISC-V
 
   * The fatal error message triggered from a fault now contains the callee-saved-registers states.