Minor typo

spec.md

@@ -3286,7 +3286,7 @@ The following conditions are well defined:
 | Condition | gRPC Code | Description | Recovery Behavior |
 |-----------|-----------|-------------|-------------------|
 | Missing or otherwise invalid argument | 3 INVALID_ARGUMENT | Indicates that a required argument field was not specified or an argument value is invalid | The caller should correct the error and resubmit the call. |
-| Invalid `snapshot_id` | 5 NOT_FOUND | Indicates that the snapshot specified was not found. | The caller should re-check that these objects exist. |
+| Invalid `snapshot_id` | 5 NOT_FOUND | Indicates that the snapshot specified was not found. | The caller should re-check that this object exists. |
 | Invalid `starting_offset` | 11 OUT_OF_RANGE | The starting offset exceeds the volume size. | The caller should specify a `starting_offset` less than the volume's size. |
 | Invalid `security_token` | 16 UNAUTHENTICATED | The specified authentication token is invalid or has expired. | The caller should obtain a new security token. |