Fix param name to match the doc in SelectorList.xpath()

docs/usage.rst

@@ -1130,7 +1130,7 @@ Converting CSS to XPath
 
 When you're using an API that only accepts XPath expressions, it's sometimes
 useful to convert CSS to XPath. This allows you to take advantage of the
-conciseness of CSS to query elements by classes and the easeness of
+conciseness of CSS to query elements by classes and the easiness of
 manipulating XPath expressions at the same time.
 
 On those occasions, use the function :func:`~parsel.css2xpath`:

parsel/selector.py

@@ -73,7 +73,7 @@ def __getitem__(self, pos):
     def __getstate__(self):
         raise TypeError("can't pickle SelectorList objects")
 
-    def xpath(self, xpath, namespaces=None, **kwargs):
+    def xpath(self, query, namespaces=None, **kwargs):
         """
         Call the ``.xpath()`` method for each element in this list and return
         their results flattened as another :class:`SelectorList`.
@@ -90,7 +90,7 @@ def xpath(self, xpath, namespaces=None, **kwargs):
 
             selector.xpath('//a[href=$url]', url="http://www.example.com")
         """
-        return self.__class__(flatten([x.xpath(xpath, namespaces=namespaces, **kwargs) for x in self]))
+        return self.__class__(flatten([x.xpath(query, namespaces=namespaces, **kwargs) for x in self]))
 
     def css(self, query):
         """