docs: fix links (vuejs#96)

Author: kazupon

docs/en/api/mount.md

@@ -1,4 +1,4 @@
-# mount(component,{,options}])
+# mount(component {, options}])
 
 - **Arguments:**
 

docs/en/api/shallow.md

@@ -1,4 +1,4 @@
-# shallow(component,{,options}])
+# shallow(component {, options}])
 
 - **Arguments:**
 
@@ -19,15 +19,15 @@
 
 - **Options:**
 
-See [options](/docs/en/api/options.md)
+See [options](./options.md)
 
 - **Usage:**
 
-Returns [`Wrapper`](/docs/en/api/wrapper/README.md) of first DOM node or Vue component matching selector.
+Returns [`Wrapper`](./wrapper/README.md) of first DOM node or Vue component matching selector.
 
 Stubs all child components.
 
-Use any valid [selector](/docs/en/api/selectors.md).
+Use any valid [selector](./selectors.md).
 
 **Without options:**
 

docs/en/api/wrapper/find.md

@@ -24,4 +24,4 @@ const bar = wrapper.find(Bar)
 expect(bar.is(Bar)).toBe(true)
 ```
 
-- **See also:** [Wrapper](/docs/en/api/wrapper/README.md)
+- **See also:** [Wrapper](README.md)

docs/en/guides/common-tips.md

@@ -58,7 +58,7 @@ expect(wrapper.emitted().foo.length).toBe(2)
 expect(wrapper.emitted().foo[1]).toEqual([123])
 ```
 
-You can also get an Array of the events in their emit order by calling [wrapper.emittedByOrder()](../api/emittedByOrder.md).
+You can also get an Array of the events in their emit order by calling [wrapper.emittedByOrder()](../api/wrapper/emittedByOrder.md).
 
 ## Manipulating Component State
 
@@ -86,7 +86,7 @@ mount(Component, {
 
 You can also update the props of an already-mounted component with the `wrapper.setProps({})` method.
 
-*For a full list of options, please see the [mount options section](./api/options.md) of the docs.*
+*For a full list of options, please see the [mount options section](../api/options.md) of the docs.*
 
 ## Applying Global Plugins and Mixins