Document: add change.snapshotSelection in the change.md (#1534)

* docs: add chang.snapshotSelection * Minor style tweaks
ianstormtaylor · Jan 17, 2018 · e6c7934 · e6c7934
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commit e6c7934
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diff --git a/docs/reference/slate/change.md b/docs/reference/slate/change.md
@@ -474,3 +474,8 @@ Move forward one step in the history.
 `undo() => Change`
 
 Move backward one step in the history.
+
+### `snapshotSelection`
+`snapshotSelection() => Change`
+
+Snapshot `value.selection` for `undo` purposes, useful with delete operations like `removeNodeByKey(focusBlock.key).undo()`