pretext warnings: subsection and introduction

[habibasorour]

Description

warning: * PTX:WARNING: In a section containing subsections, any content that is not inside a subsection needs to be inside an and/or .

•          located at: pretext/book/chapter/section
  

•          located within: "using-conditional-in-java" (xml:id), "Using Conditional Statements in Java" (title)
  

Screenshot

[habibasorour]

working on this