Clean up RELEASE_NOTES.md

Author: kyyalama2

RELEASE_NOTES.md

@@ -1,9 +1,6 @@
 # AWS EC2 FPGA HDK+SDK Release Notes
 
 **NOTE:** See [ERRATA](./ERRATA.md) for unsupported features
-## Release 1.4.23
-* AWS supports [migration](./hdk/docs/U200_to_F1_migration_HDK.md) from U200 Vivado development flow to F1 HDK flow using F1.A.1.4 shell
-
 ## Release 1.4.24
 * AWS supports [migration](./hdk/docs/U200_to_F1_migration_HDK.md) from U200 Vivado development flow to F1 HDK flow using F1.A.1.4 shell