Merge "Update PreferenceCategory headers to use headline font." into pi-dev

            android:layout_marginTop="16dp"

            android:layout_width="match_parent"

            android:layout_height="wrap_content"

            android:fontFamily="@*android:string/config_headlineFontFamilyMedium"

            android:textAppearance="@android:style/TextAppearance.Material.Body2"

            android:textAlignment="viewStart"

            android:textColor="?android:attr/colorAccent"