Fix grammar, spelling in recently added docs.

docs/generic/custom_resolver.rst

@@ -19,7 +19,7 @@ __ django_assets_
 
 For normal usage, you will not need to write your own resolver, or
 indeed need to know how they work. However, if you want to integrate
-``webassets`` with another framework, or if you applicatoin is
+``webassets`` with another framework, or if your application is
 complex enough that it requires custom file referencing, read on.
 
 
@@ -45,10 +45,10 @@ Methods to overwrite
 However, in practice, you will usually want to override the builtin
 :class:`Resolver`, and customize it's behaviour where necessary. The
 default resolver already splits what is is doing into multiple
-methods; so that you can either override then, or
+methods; so that you can either override them, or
 refer to them in your own implementation, as makes sense.
 
-Instead of the official entry points above, may may instead prefer
+Instead of the official entrypoints above, you may instead prefer
 to override the following methods of the default resolver class:
 
 .. automethod:: Resolver.search_for_source
@@ -103,7 +103,9 @@ directory part.
             return self.consider_single_directory(self.map[prefix], name)
 
 
-Using it::
+Using it:
+
+.. code-block:: python
 
      env = webassets.Environment(path, url)
      env.resolver = PrefixResolver(env, {

src/webassets/env.py

@@ -153,7 +153,7 @@ def consider_single_directory(self, directory, item):
         resolve glob instructions.
 
         Subclasses can call this when they have narrowed done the
-        location of a bundle to a single directory.
+        location of a bundle item to a single directory.
         """
         expr = path.join(directory, item)
         if has_magic(expr):
@@ -213,7 +213,7 @@ def query_url_mapping(self, filepath):
         the correct url for ``filepath``.
 
         Subclasses should be sure that they really want to call this
-        method, instead of simply falling back to the ``super()``.
+        method, instead of simply falling back to ``super()``.
         """
         # Build a list of dir -> url mappings
         mapping = self.env.url_mapping.items()
@@ -244,7 +244,7 @@ def resolve_source(self, item):
             reason why the name of this method does not imply a
             return type.
 
-        The incoming is usually a relative path, but may also be
+        The incoming item is usually a relative path, but may also be
         an absolute path, or a url. These you will commonly want to
         return unmodified.