Updated mediawiki/extensions
Project: mediawiki/extensions/TemplateData  45055e43ba451a64554eaa15891c2accb3db2855

spec: Remove remnant mention of InterfaceText allowing null

Follows-up 2c89726 which removed support for null values
in InterfaceText. The uses of InterfaceText that allow null
says so explicitly in their signature (e.g. Root.description
can be InterfaceText or null, whereas Set.label must be
InterfaceText and never null).

Change-Id: Ied1dbadd6b65d8b21244617d31a9fdd64edf8e2a