Add notice docs

.gitbook/SUMMARY.md

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 # Table of contents
 
 * [Welcome to Boba](README.md)
+* [Notices](contents/notices/README.md)
+  * [Prepare for Fraud Proofs on Boba Sepolia and Boba BNB Testnet](contents/notices/fraud-proofs.md)
 * [FAQ](FAQ.md)
 * [User Docs](contents/user/README.md)
   * [How To use Boba's services](contents/user/001\_how-to-bridge.md)

.gitbook/contents/notices/README.md

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+# Notices
+

.gitbook/contents/notices/fraud-proofs.md

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+# Prepare for Fraud Proofs on Boba Sepolia and Boba BNB Testnet 
+
+Fraud proofs are important for making L2 more decentrailized, allowing more community involvement in validating the L2 state. These changes allow anyone to submit or challenge a state root, an essential part of the process used for withdrawing funds from L2 to L1.
+
+## Prepare for Fault Proofs
+
+Fault proofs are expected to go live for Boba Testnets (Boba Sepolia and Boba BNB Testnet) in mid-August 2024.
+
+### Changes for Testnet Withdrawals
+
+* Withdrawal will require proving and finalizing based on the fault proof system.
+
+* Withdrawal will require 7 days to finalize depending on the outcome of the dispute game. 
+
+  > Boba Testnets withdrawals are no longer instant.
+
+* The `DisputeGameFactory` will replace the `L2OutputOracle` contract for proposing output root statements, enhancing platform security and reliability.
+
+* Valid proofs challenged by malicious players can be delayed for up to a few additional hours, incurring a very high cost to the malicious actor.
+
+### Changes for Users
+
+If you submit your proof prior to the fraud proof upgrades, you must submit it again and wait an additional seven days before you can claim your withdrawal. You may want to consider waiting until after the upgrade is complete to submit your proof.
+
+### Changes for Bridge Operators
+
+Upgrade your bridge to support new L1 smart contracts.