Fix whatsnew correct func name another set backticks

ssikdar1 · ssikdar1 · commit bc22a55fa140 · 2018-05-28T23:00:34.000-04:00
diff --git a/doc/source/whatsnew/v0.23.1.txt b/doc/source/whatsnew/v0.23.1.txt
@@ -87,7 +87,7 @@ I/O
 ^^^
 
 - Bug in :meth:`DataFrame.to_stata` which prevented exporting DataFrames to buffers and most file-like objects (:issue:`21041`)
-- 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
`@@ -87,7 +87,7 @@ I/O`
`87`	`87`	`^^^`
`88`	`88`
`89`	`89`	- Bug in :meth:`DataFrame.to_stata` which prevented exporting DataFrames to buffers and most file-like objects (:issue:`21041`)
`90`		-- Bug when :meth:`json_normalize` was called with `None` values in nested levels in JSON (:issue:`21158`)
	`90`	+- Bug when :meth:`pandas.io.json.json_normalize` was called with ``None`` values in nested levels in JSON (:issue:`21158`)
`91`	`91`	`-`
`92`	`92`
`93`	`93`	`Plotting`