DOC: Add whatsnew note of PeriodIndex.truncate bug

Licht-T · Licht-T · commit 86305f0d03d0 · 2017-11-04T03:30:18.000+09:00
diff --git a/doc/source/whatsnew/v0.22.0.txt b/doc/source/whatsnew/v0.22.0.txt
@@ -100,7 +100,7 @@ Conversion
 Indexing
 ^^^^^^^^
 
--
+- Bug in :func:`PeriodIndex.truncate` which raises ``TypeError`` when ``PeriodIndex`` is monotonic (:issue:`17717`)
 -
 -
 

Original file line number	Diff line number	Diff line change
`@@ -100,7 +100,7 @@ Conversion`
`100`	`100`	`Indexing`
`101`	`101`	`^^^^^^^^`
`102`	`102`
`103`		`--`
	`103`	+- Bug in :func:`PeriodIndex.truncate` which raises ``TypeError`` when ``PeriodIndex`` is monotonic (:issue:`17717`)
`104`	`104`	`-`
`105`	`105`	`-`
`106`	`106`