docs(fast-inbox): drop checkpointNumber from the example Inbox ABIs (A-1386)

The legacy L1 inbox cleanup removes checkpointNumber from the MessageSent event, changing its topic
again; keep the hardcoded example ABIs in lockstep.

Author: spalladino

docs/examples/ts/aave_bridge/index.ts

@@ -347,7 +347,6 @@ const INBOX_ABI = [
     type: "event",
     name: "MessageSent",
     inputs: [
-      { name: "checkpointNumber", type: "uint256", indexed: true },
       { name: "index", type: "uint256", indexed: false },
       { name: "hash", type: "bytes32", indexed: true },
       { name: "rollingHash", type: "bytes16", indexed: false },

docs/examples/ts/example_swap/index.ts

@@ -259,7 +259,6 @@ const INBOX_ABI = [
     type: "event",
     name: "MessageSent",
     inputs: [
-      { name: "checkpointNumber", type: "uint256", indexed: true },
       { name: "index", type: "uint256", indexed: false },
       { name: "hash", type: "bytes32", indexed: true },
       { name: "rollingHash", type: "bytes16", indexed: false },

docs/examples/ts/token_bridge/index.ts

@@ -164,7 +164,6 @@ const INBOX_ABI = [
     type: "event",
     name: "MessageSent",
     inputs: [
-      { name: "checkpointNumber", type: "uint256", indexed: true },
       { name: "index", type: "uint256", indexed: false },
       { name: "hash", type: "bytes32", indexed: true },
       { name: "rollingHash", type: "bytes16", indexed: false },