settings: Define logging paths with, like, normal human variables.

This makes these variables available for type-checking.

Signed-off-by: Anders Kaseorg <anders@zulipchat.com>

zerver/lib/logging_util.py

@@ -240,7 +240,7 @@ def log_to_file(logger: Logger,
                 filename: str,
                 log_format: str="%(asctime)s %(levelname)-8s %(message)s",
                 ) -> None:
-    """Note: `filename` should be declared in zproject/settings.py in ZULIP_PATHS."""
+    """Note: `filename` should be declared in zproject/settings.py with zulip_path."""
     formatter = logging.Formatter(log_format)
     handler = logging.FileHandler(filename)
     handler.setFormatter(formatter)