Rename Autofix to Fix (#7657)

**Summary** Mostly mechanical symbol rename and search-and-replace, with
small changes to the markdown docs to read better

crates/ruff_linter/resources/test/fixtures/flake8_commas/COM81.py

@@ -627,7 +627,7 @@ result = function(
     **{'ham': spam}
 )
 
-# Make sure the COM812 and UP034 rules don't autofix simultaneously and cause a syntax error.
+# Make sure the COM812 and UP034 rules don't fix simultaneously and cause a syntax error.
 the_first_one = next(
     (i for i in range(10) if i // 2 == 0)  # COM812 fix should include the final bracket
 )

crates/ruff_linter/resources/test/fixtures/flake8_pytest_style/PT018.py

@@ -33,10 +33,10 @@ message
     assert not (a or not (b or c))
     assert not (a or not (b and c))
 
-    # detected, but no autofix for messages
+    # detected, but no fix for messages
     assert something and something_else, "error message"
     assert not (something or something_else and something_third), "with message"
-    # detected, but no autofix for mixed conditions (e.g. `a or b and c`)
+    # detected, but no fix for mixed conditions (e.g. `a or b and c`)
     assert not (something or something_else and something_third)
 
 

crates/ruff_linter/resources/test/fixtures/flake8_return/RET504.py

@@ -335,7 +335,7 @@ def foo():
     return x
 
 
-# Autofix cases
+# Fix cases
 def foo():
     a = 1
     b=a

crates/ruff_linter/resources/test/fixtures/pyflakes/F841_3.py

@@ -1,4 +1,4 @@
-"""Test case for autofixing F841 violations."""
+"""Test case for fixing F841 violations."""
 
 
 def f():