docs: correct spelling mistakes (#504)

Author: EdwardBetts

semantic_release/repository.py

@@ -123,7 +123,7 @@ def _handle_repository_config(self) -> None:
     def _create_twine_settings(self, addon_kwargs: Dict[str, Any]) -> TwineSettings:
         """
         Gather all parameters that had a value set during instantiation and
-        pass them to Twine which then validates and laods the config.
+        pass them to Twine which then validates and loads the config.
         """
         params = {name: val for name, val in dataclass_asdict(self).items() if val}
         settings = TwineSettings(**params, **addon_kwargs)
@@ -148,7 +148,7 @@ def upload(
         :raises ImproperConfigurationError:
             The upload failed due to a configuration error.
 
-        :returns True if successfull, False otherwise.
+        :returns True if successful, False otherwise.
         """
         addon_kwargs = {
             "non_interactive": True,

tests/test_vcs_helpers.py

@@ -539,7 +539,7 @@ def test_update_changelog_empty_file(mock_git, mocker):
 def test_update_changelog_file_missing_placeholder(mock_git, mocker):
     mocker.patch("semantic_release.vcs_helpers.Path.exists", return_value=True)
     mocked_read_text = mocker.patch(
-        "semantic_release.vcs_helpers.Path.read_text", return_value="# Uknown header"
+        "semantic_release.vcs_helpers.Path.read_text", return_value="# Unknown header"
     )
     mocked_write_text = mocker.patch("semantic_release.vcs_helpers.Path.write_text")