docs: fix a grammar error

Author: rocwang

README.md

@@ -19,7 +19,7 @@ items (e.g. 1000+ items) as a grid in a performant way.
 ## Code Examples
 
 - [As an ES module (with a bundler)][esm]
-- [As an Universal Module Definition (no bundler)][umd]
+- [As a Universal Module Definition (no bundler)][umd]
 
 ## Install
 
@@ -30,7 +30,7 @@ npm install vue-virtual-scroll-grid
 ## Available Props
 
 | Name                       | Description                                                                       | Type                                                           | Validation                                           |
-| -------------------------- |-----------------------------------------------------------------------------------| -------------------------------------------------------------- | ---------------------------------------------------- |
+|----------------------------|-----------------------------------------------------------------------------------|----------------------------------------------------------------|------------------------------------------------------|
 | `length`                   | The number of items in the list                                                   | `number`                                                       | Required, an integer greater than or equal to 0      |
 | `pageProvider`             | The callback that returns a page of items as a promise. `pageNumber` start with 0 | `(pageNumber: number, pageSize: number) => Promise<unknown[]>` | Required                                             |
 | `pageProviderDebounceTime` | Debounce window in milliseconds on the calls to `pageProvider`                    | `number`                                                       | Optional, an integer greater than or equal to 0      |