message: ChangeSummary docs.
diff: @@ -186,16 +186,19 @@ The following examples illustrate how to go back in history using the ECSQL func
  `ECInstanceId` | `Name` | `Age`
  -------------- | ------ | ----
  +no rows | |
  `SELECT ECInstanceId, Name, Age FROM acme.Person.Changes(1,'AfterUpdate')`
  `ECInstanceId` | `Name` | `Age`
  -------------- | ------ | ----
  +no rows | |
  `SELECT ECInstanceId, Name, Age FROM acme.Person.Changes(1,'BeforeDelete')`
  `ECInstanceId` | `Name` | `Age`
  -------------- | ------ | ----
  +no rows | |
  ##### Changes in Change Summary 2
  @@ -221,6 +224,7 @@ The following examples illustrate how to go back in history using the ECSQL func
  `ECInstanceId` | `Name` | `Age`
  -------------- | ------ | ----
  +no rows | |
  ##### Changes in Change Summary 3
  @@ -228,16 +232,19 @@ The following examples illustrate how to go back in history using the ECSQL func
  `ECInstanceId` | `Name` | `Age`
  -------------- | ------ | ----
  +no rows | |
  `SELECT ECInstanceId, Name, Age FROM acme.Person.Changes(3,'BeforeUpdate')`
  `ECInstanceId` | `Name` | `Age`
  -------------- | ------ | ----
  +no rows | |
  `SELECT ECInstanceId, Name, Age FROM acme.Person.Changes(3,'AfterUpdate')`
  `ECInstanceId` | `Name` | `Age`
  -------------- | ------ | ----
  +no rows | |
  `SELECT ECInstanceId, Name, Age FROM acme.Person.Changes(3,'BeforeDelete')`
  