Rewrite pseudo "type:" comments for pylint 2.0

See https://github.com/PyCQA/pylint/issues/2299

qutebrowser/browser/webkit/mhtml.py

@@ -312,7 +312,7 @@ class _Downloader:
         for style in styles:
             style = webkitelem.WebKitElement(style, tab=self.tab)
             # The Mozilla Developer Network says:
-            # type: This attribute defines the styling language as a MIME type
+            # type - This attribute defines the styling language as a MIME type
             # (charset should not be specified). This attribute is optional and
             # default to text/css if it's missing.
             # https://developer.mozilla.org/en/docs/Web/HTML/Element/style

qutebrowser/misc/sql.py

@@ -74,7 +74,7 @@ class SqliteError(SqlError):
             '13',  # SQLITE_FULL
         ]
         # At least in init(), we can get errors like this:
-        # type: ConnectionError
+        # type - ConnectionError
         # database text: out of memory
         # driver text: Error opening database
         # error code: -1