blockquote filter: clearer variable names

tools/filters/blockquote2div.py

@@ -104,9 +104,9 @@ def blockquote2div(key, value, format, meta):
 
         id, classes, kvs = attr
 
-        ltitle = pf.stringify(inlines).lower()
-        if ltitle in SPECIAL_TITLES:
-            classes.append(SPECIAL_TITLES[ltitle])
+        lowercase_title = pf.stringify(inlines).lower()
+        if lowercase_title in SPECIAL_TITLES:
+            classes.append(SPECIAL_TITLES[lowercase_title])
 
         if len(classes) == 1 and classes[0] in SPECIAL_CLASSES:
             remove_attributes(blockquote)