[DOC] Add list mark to keep select_columns's example same style (#888)

* [DOC] add list mark

* Update CHANGELOG.md

Author: Zeroto521

CHANGELOG.md

@@ -20,6 +20,7 @@
 -   [ENH] Deprecate `limit` from fill_direction. fill_direction now uses kwargs. @samukweku
 -   [ENH] Added `conditional_join` function that supports joins on non-equi operators. @samukweku
 -   [INF] Speed up pytest via `-n` (pytest-xdist) option. Issue #881. @Zeroto521
+-   [DOC] Add list mark to keep `select_columns`'s example same style. @Zeroto521
 
 ## [v0.21.0] - 2021-07-16
 

janitor/functions.py

@@ -3326,7 +3326,7 @@ def select_columns(
        0   0
        1   1
 
-    Select via shell-like glob strings (*) is possible::
+    - Select via shell-like glob strings (*) is possible::
 
         df.select_columns("*type*")