Apply suggestions from code review

Co-authored-by: William Durand <will+git@drnd.me>

src/olympia/blocklist/tests/test_mlbf.py

@@ -532,27 +532,30 @@ def test_diff_all_possible_changes(self):
         )
         # The second version is hard blocked.
         block_factory(guid=two.guid, updated_by=self.user, block_type=BlockType.BLOCKED)
-        # 3. Soft blocked -> (Blocked)
+        # 3 was soft-blocked and is now hard blocked.
         three_block.blockversion_set.first().update(block_type=BlockType.BLOCKED)
-        # 4. Soft blocked -> (Not blocked)
+        # 4 was soft blocked and is now unblocked.
         four_block.delete()
-        # 5. Blocked -> (Soft blocked)
+        # 5 was hard blocked and is now soft blocked.
         five_block.blockversion_set.first().update(block_type=BlockType.SOFT_BLOCKED)
-        # 6. Blocked -> (Not blocked)
+        # 6 was hard blocked and is now unblocked.
         six_block.delete()
 
+
+        # We regenerate another MLBF based on the updates we've just done to verify the final
+        # state of each version.
         second_mlbf = MLBF.generate_from_db('second')
 
         # The order is based on the ID (i.e. creation time) of the block,
-        # not the version so we expect two after three
-        # since two was blocked after three
+        # not the version so we expect two after three since two was
+        # blocked after three.
         assert second_mlbf.generate_diffs(previous_mlbf=first_mlbf) == {
             BlockType.BLOCKED: (
                 [three_hash, two_hash],
                 [five_hash, six_hash],
                 4,
             ),
-            # Same as above, one had a block created after five so it comes second
+            # Same as above, one had a block created after five so it comes second.
             BlockType.SOFT_BLOCKED: (
                 [five_hash, one_hash],
                 [three_hash, four_hash],