docs: use "constructor" for from_settings() & rom_crawler() factory methods

Issue #4086

scrapy/utils/misc.py

@@ -123,14 +123,14 @@ def rel_has_nofollow(rel):
 
 def create_instance(objcls, settings, crawler, *args, **kwargs):
     """Construct a class instance using its ``from_crawler`` or
-    ``from_settings`` ``__init__`` methods, if available.
+    ``from_settings`` constructors, if available.
 
     At least one of ``settings`` and ``crawler`` needs to be different from
     ``None``. If ``settings `` is ``None``, ``crawler.settings`` will be used.
-    If ``crawler`` is ``None``, only the ``from_settings`` ``__init__`` method will be
+    If ``crawler`` is ``None``, only the ``from_settings`` constructor will be
     tried.
 
-    ``*args`` and ``**kwargs`` are forwarded to the ``__init__`` methods.
+    ``*args`` and ``**kwargs`` are forwarded to the constructors.
 
     Raises ``ValueError`` if both ``settings`` and ``crawler`` are ``None``.
     """

tests/test_utils_misc/__init__.py

@@ -109,11 +109,11 @@ class UtilsMiscTestCase(unittest.TestCase):
             else:
                 mock.assert_called_once_with(*args, **kwargs)
 
-        # Check usage of correct __init__ method using four mocks:
-        #   1. with no alternative __init__ methods
-        #   2. with from_settings() __init__ method
-        #   3. with from_crawler() __init__ method
-        #   4. with from_settings() and from_crawler() __init__ method
+        # Check usage of correct constructor using four mocks:
+        #   1. with no alternative constructors
+        #   2. with from_settings() constructor
+        #   3. with from_crawler() constructor
+        #   4. with from_settings() and from_crawler() constructor
         spec_sets = ([], ['from_settings'], ['from_crawler'],
                      ['from_settings', 'from_crawler'])
         for specs in spec_sets: