Fix comment

Sources/Algorithm.swift

@@ -50,19 +50,19 @@ public extension StagedChangeset where Collection: RangeReplaceableCollection, C
  let sourceElements = ContiguousArray(source)
  let targetElements = ContiguousArray(target)
 
- // Returns the empty changesets if both are empty.
+ // Return empty changesets if both are empty.
  if sourceElements.isEmpty && targetElements.isEmpty {
  self.init()
  return
  }
 
- // Returns the changesets that all deletions if source is not empty and target is empty.
+ // Return changesets that all deletions if source is not empty and target is empty.
  if !sourceElements.isEmpty && targetElements.isEmpty {
  self.init([Changeset(data: target, elementDeleted: sourceElements.indices.map { ElementPath(element: $0, section: section) })])
  return
  }
 
- // Returns the changesets that all insertions if source is empty and target is not empty.
+ // Return changesets that all insertions if source is empty and target is not empty.
  if sourceElements.isEmpty && !targetElements.isEmpty {
  self.init([Changeset(data: target, elementInserted: targetElements.indices.map { ElementPath(element: $0, section: section) })])
  return
@@ -234,7 +234,7 @@ public extension StagedChangeset where Collection: RangeReplaceableCollection, C
  }
  }
 
-  // Track an target and source indices of the elements having same identifier.
+ // Track target and source indices of the elements having same identifier.
  for targetSectionIndex in contiguousTargetSections.indices {
  let targetElements = contiguousTargetSections[targetSectionIndex]
 
@@ -491,7 +491,7 @@ internal func differentiate<E: Differentiable, I>(
  }
  }
 
- // Track an target and source indices of the elements having same identifier.
+ // Track target and source indices of the elements having same identifier.
  for targetIndex in target.indices {
  var targetIdentifier = target[targetIndex].differenceIdentifier
  let key = TableKey(pointer: &targetIdentifier)