Update description files(DTD) version for xml files

• Type: Story
• Status: Closed
• Priority: Minor
• Resolution: Inactive
• Affects Version/s: None
• Fix Version/s: None
• Component/s: Dev Tools, Dev Tools > Plugins SDK
• Labels: None

1.Create a portlet in plugins-sdk master.
2.Open the following files:
liferay-display.xml
liferay-portlet.xml

or
Created a hook project and open the liferay-hook.xml.

you will find the the dtd files version still using the 6.2.0 but it should be 7.0.0