api: Fix docstring-section-indent errors

Fix docstring-section-indent errors and resulting line-too-long
errors, but not other existing line-too-long errors.

BUG=b:233893248
TEST=cros lint

Change-Id: I552ce489aaabce6e6600e2518385569ce59b134e
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/chromite/+/3947314
Reviewed-by: Gilberto Contreras <gcontreras@google.com>
Tested-by: Alex Klein <saklein@chromium.org>
Auto-Submit: Alex Klein <saklein@chromium.org>
Commit-Queue: Gilberto Contreras <gcontreras@google.com>
diff --git a/api/controller/image_unittest.py b/api/controller/image_unittest.py
index dd230b7..92caa26 100644
--- a/api/controller/image_unittest.py
+++ b/api/controller/image_unittest.py
@@ -287,11 +287,11 @@
         """Helper to create Mock build_image results.
 
         Args:
-          image_types: A list of image types for which the mock BuildResult has to
-            be creates.
+            image_types: A list of image types for which the mock BuildResult has to
+                be creates.
 
         Returns:
-          A list of mock BuildResult.
+            A list of mock BuildResult.
         """
         image_types_names = [
             image_controller.SUPPORTED_IMAGE_TYPES[x]