typos adr-049-state-sync-hooks.md

Author: Dimitrolito

Diff for: docs/architecture/adr-049-state-sync-hooks.md

@@ -116,7 +116,7 @@ type ExtensionPayloadReader = func() ([]byte, error)
 type ExtensionPayloadWriter = func([]byte) error
 
 // ExtensionSnapshotter is an extension Snapshotter that is appended to the snapshot stream.
-// ExtensionSnapshotter has an unique name and manages it's own internal formats.
+// ExtensionSnapshotter has a unique name and manages it's own internal formats.
 type ExtensionSnapshotter interface {
 	// SnapshotName returns the name of snapshotter, it should be unique in the manager.
 	SnapshotName() string