Fix events.md markdown syntax issues

docs/docs/events.md

 });
 ```
 |       Parameter         | Description |
-|--------------------|:-----|
-**componentId**| Id of the appearing component
-**componentName**|Registered name used when registering the component with `Navigation.registerComponent()`
+|:--------------------:|:-----|
+**componentId**| Id of the appearing component|
+**componentName**|Registered name used when registering the component with `Navigation.registerComponent()`|
 
 ## componentDidDisappear
 Called each time this component disappears from screen (detached from the view heirarchy)
 });
 ```
 |       Parameter         | Description |
-|--------------------|:-----|
-**componentId**| Id of the disappearing component
-**componentName**|Registered name used when registering the component with `Navigation.registerComponent()`
+|:--------------------:|:-----|
+**componentId**| Id of the disappearing component|
+**componentName**|Registered name used when registering the component with `Navigation.registerComponent()`|
 
 ## registerCommandListener
 The `commandListener` is called whenever a *Navigation command* (i.e push, pop, showModal etc) is invoked.
 });
 ```
 |       Parameter         | Description |
-|--------------------|:-----|
+|:--------------------:|:-----|
 |**name** | The name of the command that was invoked. For example `push`|
 |**params**|`commandId`: Each command is assigned a unique Id<br>`componentId`: Optional, the componentId passed to the command<br>`layout`: Optional, If the command invoked created a screen. Slim representation of the component and its options |
 
 ```
 
 |       Parameter         | Description |
-|--------------------|:-----|
+|:--------------------:|:-----|
 |**commandId** | Id of the completed command|
 |**completionTime**|Timestamp when the comand, and consecutive animations, completed.|