Fix docstring for import_type() to list all return values

Agent-Logs-Url: https://github.com/PyCQA/isort/sessions/ede8ce0d-f07c-4a61-8637-2887d3f02354

Co-authored-by: DanielNoord <13665637+DanielNoord@users.noreply.github.com>

Author: Copilot

isort/_parse_utils.py

@@ -169,11 +169,12 @@ def normalize_from_import_string(import_string: str) -> str:
 def import_type(
     line: str, config: Config
 ) -> Literal["from", "straight", "lazy_from", "lazy_straight"] | None:
-    """If the current line is an import line it will return its type (from or straight).
+    """If the current line is an import line it will return its type.
 
-    For PEP 810 lazy imports (``lazy import X`` / ``lazy from X import Y``) the
-    returned type is prefixed with ``"lazy_"`` so callers can distinguish them
-    from regular (eager) imports.
+    Possible return values are ``"straight"`` (``import X``), ``"from"``
+    (``from X import Y``), ``"lazy_straight"`` (``lazy import X``), and
+    ``"lazy_from"`` (``lazy from X import Y``).  Returns ``None`` for
+    non-import lines or lines that should be skipped.
     """
     if config.honor_noqa and line.lower().rstrip().endswith("noqa"):
         return None