Correct prestart hook description in summary (#1275)

Correct `prestart` hook description in summary

It looks like the previous description was copied from the wrong line.  
Update the `prestart (Deprecated)` hook's timing from being called
"after the start operation is invoked but before the user-specified command executes" 
to "during the create operation, after the runtime environment is created and before pivot root or any equivalent operation."

Signed-off-by: Lei Wang <[email protected]>

Author: ssst0n3

config.md

@@ -647,7 +647,7 @@ See the below table for a summary of hooks and when they are called:
 
 |           Name          | Namespace |                                                            When                                                                    |
 | ----------------------- | --------- | -----------------------------------------------------------------------------------------------------------------------------------|
-| `prestart` (Deprecated) | runtime   | After the start  operation is called but before the user-specified program command is executed.                                    |
+| `prestart` (Deprecated) | runtime   | During the create operation, after the runtime environment has been created and before the pivot root or any equivalent operation. |
 | `createRuntime`         | runtime   | During the create operation, after the runtime environment has been created and before the pivot root or any equivalent operation. |
 | `createContainer`       | container | During the create operation, after the runtime environment has been created and before the pivot root or any equivalent operation. |
 | `startContainer`        | container | After the start operation is called but before the user-specified program command is executed.                                     |