Fixed typo in changes of sphinx.conf

Author: MartinMikita

conf/sphinx/sphinx.conf

@@ -325,7 +325,7 @@ for postcode_file in glob.glob('/data/input/postcodes-*.csv'):
     if not m or not m.group(1):
         continue
     country_code = m.group(1)
-    catcmd = 'cat {}'.format(postcode_filename)
+    catcmd = 'cat {}'.format(postcode_file)
     source_tmp = """
 # /* --------------- PostCodes %(CC)s source --------------- */
 # /* TSV source */