[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

asdf/_block/manager.py

@@ -16,7 +16,7 @@ class ReadBlocks(collections.UserList):
     A list of ReadBlock instances.
 
     A simple list can't be used as other code will need
-    to genearate a weakref to instances of this class
+    to generate a weakref to instances of this class
     (and it is not possible to generate a weakref to a list).
     """
 

docs/asdf/extending/resources.rst

@@ -23,7 +23,7 @@ Installing resources via AsdfConfig
 
 The simplest way to install a resource into `asdf` is to add it at runtime using the
 `AsdfConfig.add_resource_mapping <asdf.config.AsdfConfig.add_resource_mapping>` method.
-For example, the following code istalls a schema for use with the `asdf.AsdfFile`
+For example, the following code installs a schema for use with the `asdf.AsdfFile`
 custom_schema argument:
 
 .. code-block:: python