docs: add release notes for 6140

PastaPastaPasta · PastaPastaPasta · commit e1030a058c68 · 2024-07-22T10:40:57.000-05:00
diff --git a/doc/release-notes-6140.md b/doc/release-notes-6140.md
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+Mainnet Spork Hardening
+-----------------------
+
+This version hardens all Sporks on mainnet. Sporks remain in effect on all devnets and testnet; however, on mainnet,
+the value of all sporks are hard coded to 0, or 1 for SPORK_21_QUORUM_ALL_CONNECTED. These hardened values match the
+active values historically used on mainnet, so there is no change in the network's functionality.
