docs: update Tooltip english doc (ant-design#7642)

Fixed typos.

components/tooltip/index.en-US.md

@@ -8,34 +8,34 @@ A simple text popup tip.
 
 ## When To Use
 
-- The tip shows while mouse enter, and hides while mouse leave. The Tooltip doesn't support complex text and operation.
-- It can provide an explanation of `button/text/operation` that can cover the usage of the default system `title`.
+- The tip is shown on mouse enter, and is hidden on mouse leave. The Tooltip doesn't support complex text or operations.
+- To provide an explanation of a `button/text/operation`. It's often used instead of the html `title` attribute.
 
 ## API
 
 | Property      | Description                                     | Type       | Default |
 |-----------|------------------------------------------|------------|--------|
-| title     | prompt text                                 | string/React.Element | -     |
+| title     | The text shown in the tooltip            | string\|React.Element | -     |
 
 ### Common API
 
 The following APIs are shared by Tooltip, Popconfirm, Popover.
 
 | Property      | Description                                     | Type       | Default |
 |-----------|------------------------------------------|------------|--------|
-| placement | to set the position, which can be one of `top` `left` `right` `bottom` `topLeft` `topRight` `bottomLeft` `bottomRight` `leftTop` `leftBottom` `rightTop` `rightBottom` | string     | top    |
-| getPopupContainer | to set the container of the tip, while the default is to create a `div` element in `body`. Use `getTooltipContainer` if you are using `antd@<2.5.2` | Function(triggerNode) | () => document.body |
-| arrowPointAtCenter | whether arrow pointed at the center of target, supported after `[email protected]+` | boolean | `false` |
-| autoAdjustOverflow | whether adjust popup placement automatically when popup is invisible | boolean | `true` |
-| visible   | make the float card visible or not                     | boolean       | false  |
-| onVisibleChange | callback of the visible attribute changed            | (visible) => void | none     |
-| mouseEnterDelay | delay time to show when mouse enter.unit: s | number | 0 |
-| mouseLeaveDelay | delay time to hide when mouse leave.unit: s | number | 0.1 |
-| trigger | triggering mode: can be hover, focus, or click. | string | hover |
-| overlayClassName | class name of the card                            | string | none     |
-| overlayStyle | style of the card                            | object | none    |
+| placement | The position of the tooltip relative to the target, which can be one of `top` `left` `right` `bottom` `topLeft` `topRight` `bottomLeft` `bottomRight` `leftTop` `leftBottom` `rightTop` `rightBottom`                             | string     | `top`    |
+| getPopupContainer | The DOM container of the tip, the default behavior is to create a `div` element in `body`. Use `getTooltipContainer` if you are using `antd@<2.5.2` | Function(triggerNode) | () => document.body |
+| arrowPointAtCenter | Whether the arrow is pointed at the center of target, supported after `[email protected]+` | boolean | `false` |
+| autoAdjustOverflow | Whether to adjust popup placement automatically when popup is off screen | boolean | `true` |
+| visible   | Whether the floating tooltip card is visible or not          | boolean       | `false`  |
+| onVisibleChange | Callback executed when visibility of the tooltip card is changed  | (visible) => void | - |
+| mouseEnterDelay | Delay in seconds, before tooltip is shown on mouse enter | number | 0 |
+| mouseLeaveDelay | Delay in seconds, before tooltip is hidden on mouse leave | number | 0.1 |
+| trigger | Tooltip trigger mode                                         | `hover` \| `focus` \| `click` | `hover` |
+| overlayClassName | Class name of the tooltip card                            | string | - |
+| overlayStyle | Style of the tooltip card                            | object | - |
 
 
 ## Note
 
-Please ensure that the child node of `Tooltip` accepts `onMouseEnter`, `onMouseLeave`, `onFocus`, `onClick` event.
+Please ensure that the child node of `Tooltip` accepts `onMouseEnter`, `onMouseLeave`, `onFocus`, `onClick` events.