Update index.en-US.md

Fix typos, and provide minor grammar improvements.

components/layout/index.en-US.md

@@ -20,10 +20,10 @@ The first level navigation is inclined left near a logo, and the secondary menu
 
 ### Interaction rules
 
-- The first level navigation and the last level navigation should be distincted by visualization;
+- The first level navigation and the last level navigation should be distinguishable by visualization;
 - The current item should have the highest priority of visualization;
-- When the current navigation item is collapsed, the stlye of the current navigation item will be applied to its parent level;
-- The left side navigation bar has support for both the accordion and expanding styles, you can choose the one that fits your case best.
+- When the current navigation item is collapsed, the style of the current navigation item is applied to its parent level;
+- The left side navigation bar has support for both the accordion and expanding styles; you can choose the one that fits your case the best.
 
 ## Visualization rules
 
@@ -31,27 +31,27 @@ The first level navigation is inclined left near a logo, and the secondary menu
 
 - **Emphasis by colorblock**
 
-  When background color is a deep color, you can use this pattern for the parent level navigation item of current page.
+  When background color is a deep color, you can use this pattern for the parent level navigation item of the current page.
 
 - **The highlight match stick**
 
-  When background color is a light color, you can use this pattern for the current page navigation item, we recommed using it for the last item of the navigation path.
+  When background color is a light color, you can use this pattern for the current page navigation item; we recommend using it for the last item of the navigation path.
 
-- **Hightlighted font**
+- **Highlighted font**
 
-  From the visualization aspect, hightlighted font is stronger than colorblock, this pattern is often used for the parent level of the current item.
+  From the visualization aspect, a highlighted font is stronger than colorblock; this pattern is often used for the parent level of the current item.
 
 - **Enlarge the size of the font**
 
-  `12px`、`14px` is a standard font size of navigations，`14px` is used for the first and the second level of the navigation. You can choose a appropriate font size in terms of the level of your navigation.
+  `12px`、`14px` is a standard font size of navigations，`14px` is used for the first and the second level of the navigation. You can choose an appropriate font size regarding the level of your navigation.
 
 ## Component Overview
 
 - `Layout`: The layout wrapper, in which `Header` `Sider` `Content` `Footer` or `Layout` itself can be nested, and can be placed in any parent container.
-- `Header`: The top layout with default style, in which any element can be nested, and must be placed in `Layout`.
+- `Header`: The top layout with the default style, in which any element can be nested, and must be placed in `Layout`.
 - `Sider`: The sidebar with default style and basic functions, in which any element can be nested, and must be placed in `Layout`.
-- `Content`: The content layout with default style, in which any element can be nested, and must be placed in `Layout`.
-- `Footer`: The bottom layout with default style, in which any element can be nested, and must be placed in `Layout`.
+- `Content`: The content layout with the default style, in which any element can be nested, and must be placed in `Layout`.
+- `Footer`: The bottom layout with the default style, in which any element can be nested, and must be placed in `Layout`.
 
 > Based on `flex layout`, please pay attention to the [compatibility](http://caniuse.com/#search=flex).