chore: 8.1.0 alpha release notes (#16379)

Author: ecormany

api/release-notes.md

@@ -8,6 +8,16 @@ By installing and using Opentrons software, you agree to the Opentrons End-User
 
 ---
 
+## Opentrons Robot Software Changes in 8.1.0
+
+Welcome to the v8.1.0 release of the Opentrons robot software!
+
+### Hardware Support
+
+- Latest production version of Flex robots
+
+---
+
 ## Opentrons Robot Software Changes in 8.0.0
 
 Welcome to the v8.0.0 release of the Opentrons robot software!

app-shell/build/release-notes.md

@@ -8,6 +8,14 @@ By installing and using Opentrons software, you agree to the Opentrons End-User
 
 ---
 
+## Opentrons App Changes in 8.1.0
+
+Welcome to the v8.1.0 release of the Opentrons App!
+
+There are no changes to the Opentrons App in v8.1.0, but it is required for updating the robot software to support the latest production version of Flex robots.
+
+---
+
 ## Opentrons App Changes in 8.0.0
 
 Welcome to the v8.0.0 release of the Opentrons App!