Run a minor code quality checker over the repo (#8524)

* Run a minor code quality checker over the repo

Largely targeted at spelling of common words and misc code issues.

* Update snapshots

src/components/views/auth/CountryDropdown.tsx

@@ -135,7 +135,7 @@ export default class CountryDropdown extends React.Component<IProps, IState> {
         });
 
         // default value here too, otherwise we need to handle null / undefined
-        // values between mounting and the initial value propgating
+        // values between mounting and the initial value propagating
         const value = this.props.value || this.state.defaultCountry.iso2;
 
         return <Dropdown