Fix whatsnew correct func name another set backticks

ssikdar1 · ssikdar1 · commit 049d184122fd · 2018-05-28T22:11:34.000-04:00
diff --git a/doc/source/whatsnew/v0.23.1.txt b/doc/source/whatsnew/v0.23.1.txt
@@ -81,7 +81,7 @@ Indexing
 I/O
 ^^^
 
-- Bug when :meth:`json_normalize` was called with `None` values in nested levels in JSON  (:issue:`21158`)
+- Bug when :meth:`pandas.io.json.json_normalize` was called with ``None`` values in nested levels in JSON  (:issue:`21158`)
 -
 
 Plotting

Original file line number	Diff line number	Diff line change
`@@ -81,7 +81,7 @@ Indexing`
`81`	`81`	`I/O`
`82`	`82`	`^^^`
`83`	`83`
`84`		-- Bug when :meth:`json_normalize` was called with `None` values in nested levels in JSON (:issue:`21158`)
	`84`	+- Bug when :meth:`pandas.io.json.json_normalize` was called with ``None`` values in nested levels in JSON (:issue:`21158`)
`85`	`85`	`-`
`86`	`86`
`87`	`87`	`Plotting`