Grammar fixes

docs/source/internal/utils.rst

@@ -51,7 +51,7 @@ path if the string has a ``/`` in it. It also removes trailing ``/``\ s.
 .. autofunction:: flake8.utils.normalize_paths
 
 This function utilizes :func:`~flake8.utils.parse_comma_separated_list` and
-:func:`~flake8.utils.normalize_path` to normalize it's input to a list of
+:func:`~flake8.utils.normalize_path` to normalize its input to a list of
 strings that should be paths.
 
 .. autofunction:: flake8.utils.stdin_get_value

docs/source/plugin-development/cross-compatibility.rst

@@ -161,7 +161,7 @@ some plugins. |Flake8| 2.5 and earlier had started monkey-patching pep8's
 monkey-patched that. 3.0 has its own internal implementation and uses that but
 does not directly provide anything for plugins using pep8 and pycodestyle's
 ``stdin_get_value`` function. |polyfill| provides this functionality for
-plugin developers via it's :mod:`flake8_polyfill.stdin` module.
+plugin developers via its :mod:`flake8_polyfill.stdin` module.
 
 If a plugin needs to read the content from stdin, it can do the following:
 

docs/source/user/python-api.rst

@@ -11,7 +11,7 @@ be documented here.
 Legacy API
 ==========
 
-When |Flake8| broke it's hard dependency on the tricky internals of
+When |Flake8| broke its hard dependency on the tricky internals of
 pycodestyle, it lost the easy backwards compatibility as well. To help
 existing users of that API we have :mod:`flake8.api.legacy`. This module
 includes a couple classes (which are documented below) and a function.

docs/source/user/violations.rst

@@ -218,7 +218,7 @@ Selecting and Ignoring Simultaneously For Fun and Profit
 ========================================================
 
 Prior to |Flake8| 3.0, all handling of :option:`flake8 --select` and
-:option:`flake8 --ignore` was delegated to pycodestyle. It's handling of the
+:option:`flake8 --ignore` was delegated to pycodestyle. Its handling of the
 options significantly differs from how |Flake8| 3.0 has been designed.
 
 pycodestyle has always preferred ``--ignore`` over ``--select`` and will

src/flake8/plugins/manager.py

@@ -339,7 +339,7 @@ class PluginManager(object):  # pylint: disable=too-few-public-methods
 
 def version_for(plugin):
     # (Plugin) -> Union[str, NoneType]
-    """Determine the version of a plugin by it's module.
+    """Determine the version of a plugin by its module.
 
     :param plugin:
         The loaded plugin