Fix a quick documentation typo.

Fix the object of the sentence to agree with the plural verb.

docs/reference/modules/snapshots.asciidoc

@@ -195,7 +195,7 @@ It returns a list of nodes where repository was successfully verified or an erro
 [float]
 === Snapshot
 
-A repository can contain multiple snapshots of the same cluster. Snapshot are identified by unique names within the
+A repository can contain multiple snapshots of the same cluster. Snapshots are identified by unique names within the
 cluster. A snapshot with the name `snapshot_1` in the repository `my_backup` can be created by executing the following
 command: