chore: remove repetitive words

Signed-off-by: jimmycathy <clonecode@outlook.com>

zcash_client_backend/src/scanning.rs

@@ -1100,7 +1100,7 @@ fn find_received<
     {
         // Collect block note commitments
         let node = extract_note_commitment(output);
-        // If the commitment is the last in the block, ensure that is is retained as a checkpoint
+        // If the commitment is the last in the block, ensure that is retained as a checkpoint
         let is_checkpoint = output_idx + 1 == decoded.len() && last_commitments_in_block;
         let retention = match (decrypted_note.is_some(), is_checkpoint) {
             (is_marked, true) => Retention::Checkpoint {

zcash_history/src/lib.rs

@@ -35,7 +35,7 @@ impl std::fmt::Display for Error {
     }
 }
 
-/// Reference to to the tree node.
+/// Reference to the tree node.
 #[repr(C)]
 #[derive(Clone, Copy, Debug)]
 pub enum EntryLink {

zcash_history/src/tree.rs

@@ -72,7 +72,7 @@ impl<V: Version> Tree<V> {
         }
     }
 
-    /// New view into the the tree array representation
+    /// New view into the tree array representation
     ///
     /// `length` is total length of the array representation (is generally not a sum of
     ///     peaks.len + extra.len)