fixup comments

src/_pytest/assertion/rewrite.py

@@ -685,8 +685,8 @@ def run(self, mod: ast.Module) -> None:
             # Nothing to do.
             return
 
-        # Insert some special imports at the top of the module but after any
-        # docstrings and __future__ imports.
+        # We'll insert some special imports at the top of the module, but after any
+        # docstrings and __future__ imports, so first figure out where that is.
         doc = getattr(mod, "docstring", None)
         expect_docstring = doc is None
         if doc is not None and self.is_rewrite_disabled(doc):
@@ -718,6 +718,7 @@ def run(self, mod: ast.Module) -> None:
             lineno = item.decorator_list[0].lineno
         else:
             lineno = item.lineno
+        # Now actually insert the special imports.
         if sys.version_info >= (3, 10):
             aliases = [
                 ast.alias("builtins", "@py_builtins", lineno=lineno, col_offset=0),
@@ -737,6 +738,7 @@ def run(self, mod: ast.Module) -> None:
             ast.Import([alias], lineno=lineno, col_offset=0) for alias in aliases
         ]
         mod.body[pos:pos] = imports
+
         # Collect asserts.
         nodes: List[ast.AST] = [mod]
         while nodes: