chore: import upstream snapshot with attribution

docs/md/explanation/table/clear_and_replace.md

@@ -0,0 +1,23 @@
+# `Table::clear` and `Table::replace`
+
+Calling `Table::clear` will remove all data from the underlying `Table`. Calling
+`Table::replace` with new data will clear the `Table`, and update it with a new
+dataset that conforms to Perspective's data types and the existing schema on the
+`Table`.
+
+<div class="javascript">
+
+```javascript
+table.clear();
+table.replace(json);
+```
+
+</div>
+<div class="python">
+
+```python
+table.clear()
+table.replace(df)
+```
+
+</div>