fix a few small spelling issues

found via `pre-commit try-repo https://github.com/codespell-project/codespell --all-files`

docs/source/internal/checker.rst

@@ -5,7 +5,7 @@
 In |Flake8| 2.x, |Flake8| delegated check running to pep8. In 3.0 |Flake8|
 takes on that responsibility. This has allowed for simpler
 handling of the ``--jobs`` parameter (using :mod:`multiprocessing`) and
-simplified our fallback if something goes awry with concurency.
+simplified our fallback if something goes awry with concurrency.
 At the lowest level we have a |FileChecker|. Instances of |FileChecker| are
 created for *each* file to be analyzed by |Flake8|. Each instance, has a copy
 of all of the plugins registered with setuptools in the ``flake8.extension``

docs/source/internal/index.rst

@@ -4,7 +4,7 @@
 
 While writing |Flake8| 3.0, the developers attempted to capture some reasoning
 and decision information in internal documentation meant for future developers
-and maintaners. Most of this information is unnecessary for users and plugin
+and maintainers. Most of this information is unnecessary for users and plugin
 developers. Some of it, however, is linked to from the plugin development
 documentation.
 

docs/source/release-notes/3.7.7.rst

@@ -6,8 +6,8 @@ You can view the `3.7.7 milestone`_ on GitLab for more details.
 Bugs Fixed
 ~~~~~~~~~~
 
-- Fix crahes in plugins causing ``flake8`` to hang while unpickling errors (See
-  also `GitLab!308`_, `GitLab#505`_)
+- Fix crashes in plugins causing ``flake8`` to hang while unpickling errors
+  (See also `GitLab!308`_, `GitLab#505`_)
 
 
 .. all links

docs/source/release-notes/3.8.2.rst

@@ -6,7 +6,7 @@ You can view the `3.8.2 milestone`_ on GitLab for more details.
 Bugs Fixed
 ~~~~~~~~~~
 
-- Improve performance by eliminating unncessary sort (See also `GitLab!429`_)
+- Improve performance by eliminating unnecessary sort (See also `GitLab!429`_)
 
 - Improve messaging of ``--jobs`` argument by utilizing ``argparse`` (See also
   `GitLab!428`_, `GitLab#567`_)

docs/source/user/violations.rst

@@ -196,7 +196,7 @@ Now let's select all ``E`` class violations:
     example.py:4:9: E131 continuation line unaligned for hanging indent
     example.py:5:9: E121 continuation line under-indented for hanging indent
 
-Suddenly we now have far more erors that are reported to us. Using
+Suddenly we now have far more errors that are reported to us. Using
 ``--select`` alone will override the default ``--ignore`` list. In these cases,
 the user is telling us that they want all ``E`` violations and so we ignore
 our list of violations that we ignore by default.