s/avalanche/turbine (#4561)

* s/avalanche/turbine/g

book/src/leader-leader-transition.md

@@ -45,7 +45,7 @@ The upsides compared to guards:
 * The timeout is not fixed.
 
 * The timeout is local to the leader, and therefore can be clever.  The leader's
-heuristic can take into account avalanche performance.
+heuristic can take into account turbine performance.
 
 * This design doesn't require a ledger hard fork to update.
 

book/src/staking-rewards.md

@@ -48,7 +48,7 @@ specific parameters will be necessary:
 
 Solana's trustless sense of time and ordering provided by its PoH data
 structure, along with its
-[avalanche](https://www.youtube.com/watch?v=qt_gDRXHrHQ&t=1s) data broadcast
+[turbine](https://www.youtube.com/watch?v=qt_gDRXHrHQ&t=1s) data broadcast
 and transmission design, should provide sub-second transaction confirmation times that scale
 with the log of the number of nodes in the cluster. This means we shouldn't
 have to restrict the number of validating nodes with a prohibitive 'minimum

core/src/cluster_info.rs

@@ -87,7 +87,7 @@ pub struct ClusterInfo {
 pub struct Locality {
     /// The bounds of the neighborhood represented by this locality
     pub neighbor_bounds: (usize, usize),
-    /// The `avalanche` layer this locality is in
+    /// The `turbine` layer this locality is in
     pub layer_ix: usize,
     /// The bounds of the current layer
     pub layer_bounds: (usize, usize),
@@ -1414,7 +1414,7 @@ impl ClusterInfo {
     }
 }
 
-/// Avalanche logic
+/// Turbine logic
 /// 1 - For the current node find out if it is in layer 1
 /// 1.1 - If yes, then broadcast to all layer 1 nodes
 ///      1 - using the layer 1 index, broadcast to all layer 2 nodes assuming you know neighborhood size

core/tests/cluster_info.rs

@@ -126,7 +126,7 @@ fn run_simulation(stakes: &[u64], fanout: usize) {
 
     assert!(!batches.is_empty());
 
-    // start avalanche simulation
+    // start turbine simulation
     let now = Instant::now();
     batches.par_iter_mut().for_each(|batch| {
         let mut cluster = c_info.clone();