chore: fix typos (#7877)

Co-authored-by: Dimitris Apostolou <dimitris.apostolou@icloud.com>

zebra-chain/src/block/arbitrary.rs

@@ -665,7 +665,7 @@ where
         attempts += 1;
 
         // Avoid O(n^2) algorithmic complexity by giving up early,
-        // rather than exhausively checking the entire UTXO set
+        // rather than exhaustively checking the entire UTXO set
         if attempts > 100 {
             return None;
         }

zebra-chain/src/block/tests/vectors.rs

@@ -385,7 +385,7 @@ fn node_time_check(
 fn time_check_now() {
     let _init_guard = zebra_test::init();
 
-    // These checks are deteministic, because all the times are offset
+    // These checks are deterministic, because all the times are offset
     // from the current time.
     let now = Utc::now();
     let three_hours_in_the_past = now - Duration::hours(3);

zebrad/tests/common/config.rs

@@ -134,7 +134,7 @@ pub fn random_known_rpc_port_config(
     let mut config = default_test_config(network)?;
     config.rpc.listen_addr = Some(zebra_rpc_listener);
     if parallel_cpu_threads {
-        // Auto-configure to the number of CPU cores: most users configre this
+        // Auto-configure to the number of CPU cores: most users configure this
         config.rpc.parallel_cpu_threads = 0;
     } else {
         // Default config, users who want to detect port conflicts configure this