docs(props): delete key -> backspace closes #557

website/src/markdown/docs/api/component-props.md

@@ -69,5 +69,5 @@ import ReactFlow from 'react-flow-renderer';
 - `connectionLineComponent`: [custom connection line component](/example/src/CustomConnectionLine/index.js)
 
 ### Keys
-- `deleteKeyCode`: default: `8` (delete)
+- `deleteKeyCode`: default: `8` (backspace)
 - `selectionKeyCode`: default: `16` (shift)

website/src/markdown/docs/getting-started/index.md

@@ -95,7 +95,7 @@ export default () => {
 }
 ```
 
-In this example you can connect nodes and remove selected nodes and edges with the delete key.
+In this example you can connect nodes and remove selected nodes and edges with the backspace key.
 
 import Basic from './BasicFunctions';