update docs

Author: krawaller

docs/api/ReactWrapper/exists.md

@@ -1,11 +1,18 @@
-# `.exists() => Boolean`
+# `.exists([selector]) => Boolean`
+
+Returns whether or not the current node exists. Or, if a selector is passed in, whether that selector has any matching results.
+
+
+
+#### Arguments
+
+1. `selector` ([`EnzymeSelector`](../selector.md) [optional]): The selector to check existence for.
 
-Returns whether or not the current node exists.
 
 
 #### Returns
 
-`Boolean`: whether or not the current node exists.
+`Boolean`: whether or not the current node exists, or the selector had any results.
 
 
 
@@ -14,5 +21,6 @@ Returns whether or not the current node exists.
 
 ```jsx
 const wrapper = mount(<div className="some-class" />);
+expect(wrapper.exists('.some-class')).to.equal(true);
 expect(wrapper.find('.other-class').exists()).to.equal(false);
 ```

docs/api/ShallowWrapper/exists.md

@@ -1,18 +1,26 @@
-# `.exists() => Boolean`
+# `.exists([selector]) => Boolean`
+
+Returns whether or not the current node exists. Or, if a selector is passed in, whether that selector has any matching results.
+
+
+
+#### Arguments
+
+1. `selector` ([`EnzymeSelector`](../selector.md) [optional]): The selector to check existence for.
 
-Returns whether or not the current node exists.
 
 
 #### Returns
 
-`Boolean`: whether or not the current node exists.
+`Boolean`: whether or not the current node exists, or the selector had any results.
 
 
 
 #### Example
 
 
 ```jsx
-const wrapper = shallow(<div className="some-class" />);
+const wrapper = mount(<div className="some-class" />);
+expect(wrapper.exists('.some-class')).to.equal(true);
 expect(wrapper.find('.other-class').exists()).to.equal(false);
 ```

docs/api/mount.md

@@ -90,8 +90,8 @@ Returns whether or not the current root node has the given class name or not.
 #### [`.is(selector) => Boolean`](ReactWrapper/is.md)
 Returns whether or not the current node matches a provided selector.
 
-#### [`.exists() => Boolean`](ReactWrapper/exists.md)
-Returns whether or not the current node exists.
+#### [`.exists([selector]) => Boolean`](ReactWrapper/exists.md)
+Returns whether or not the current node exists, or, if given a selector, whether that selector has any matching results.
 
 #### [`.isEmpty() => Boolean`](ReactWrapper/isEmpty.md)
 *Deprecated*: Use [.exists()](ReactWrapper/exists.md) instead.

docs/api/shallow.md

@@ -97,8 +97,8 @@ Returns whether or not the current node has the given class name or not.
 #### [`.is(selector) => Boolean`](ShallowWrapper/is.md)
 Returns whether or not the current node matches a provided selector.
 
-#### [`.exists() => Boolean`](ShallowWrapper/exists.md)
-Returns whether or not the current node exists.
+#### [`.exists([selector]) => Boolean`](ShallowWrapper/exists.md)
+Returns whether or not the current node exists, or, if given a selector, whether that selector has any matching results.
 
 #### [`.isEmpty() => Boolean`](ShallowWrapper/isEmpty.md)
 *Deprecated*: Use [.exists()](ShallowWrapper/exists.md) instead.