doc: release-notes 3.1: Update with stm32f1 pin node names changes

This information is worthy to provide in release notes

Signed-off-by: Erwan Gouriou <[email protected]>

Author: erwango

doc/releases/release-notes-3.1.rst

@@ -71,9 +71,15 @@ Changes in this release
     * The previous ``CAN_SILENT_LOOPBACK_MODE`` can be set using the bitmask ``(CAN_MODE_LISTENONLY |
       CAN_MODE_LOOPBACK)``.
 
-* STM32H7 The `CONFIG_NOCACHE_MEMORY` no longer is responsible for disabling
-  data cache when defined. Now the newly introduced `CONFIG_DCACHE=n` explicitly
-  does that.
+  * STM32H7 The `CONFIG_NOCACHE_MEMORY` no longer is responsible for disabling
+    data cache when defined. Now the newly introduced `CONFIG_DCACHE=n` explicitly
+    does that.
+
+  * Converted the STM32F1 pin nodes configuration names to include remap information (in
+    cases other than NO_REMAP/REMAP_0)
+    For instance:
+
+    * ``i2c1_scl_pb8`` renamed to ``i2c1_scl_remap1_pb8``
 
 Removed APIs in this release
 ============================