Fix module path in test_mhtml

Also fix docstring for _get_css_imports

qutebrowser/browser/mhtml.py

@@ -51,7 +51,9 @@ _CSS_URL_PATTERNS = [re.compile(x) for x in [
 
 def _get_css_imports(data):
     """Return all assets that are referenced in the given CSS document.
+
     The returned URLs are relative to the stylesheet's URL.
+
     Args:
         data: The content of the stylesheet to scan as string.
     """

tests/unit/browser/test_mhtml.py

@@ -5,7 +5,7 @@ import re
 
 import pytest
 
-from qutebrowser.misc import mhtml
+from qutebrowser.browser import mhtml
 
 @pytest.fixture(autouse=True)
 def patch_uuid(monkeypatch):