Actually fix suspicious markup, I ignored it too readily

Doc/tools/susp-ignored.csv

@@ -297,7 +297,6 @@ whatsnew/3.5,,:warning,'WARNING:root:warning\n'
 whatsnew/3.5,,::,>>> addr6 = ipaddress.IPv6Address('::1')
 whatsnew/3.5,,:root,ERROR:root:exception
 whatsnew/3.5,,:exception,ERROR:root:exception
-whatsnew/3.6,,`,1000000000000000`
 whatsnew/changelog,,:version,import sys; I = version[:version.index(' ')]
 whatsnew/changelog,,:gz,": TarFile opened with external fileobj and ""w:gz"" mode didn't"
 whatsnew/changelog,,::,": Use ""127.0.0.1"" or ""::1"" instead of ""localhost"" as much as"

Doc/whatsnew/3.6.rst

@@ -139,7 +139,7 @@ PEP 515: Underscores in Numeric Literals
 
 Prior to PEP 515, there was no support for writing long numeric
 literals with some form of separator to improve readability. For
-instance, how big is ``1000000000000000```? With :pep:`515`, though,
+instance, how big is ``1000000000000000``? With :pep:`515`, though,
 you can use underscores to separate digits as desired to make numeric
 literals easier to read: ``1_000_000_000_000_000``. Underscores can be
 used with other numeric literals beyond integers, e.g.