Absolute paths are prohibited in JSP, because they won't be resolved if your application context is not empty.
The quick-fix adds a dynamic prefix to your path.
Example:
<%@page contentType="text/html; ISO-8859-1" %>
<a href="/hey.jsp">hey</a>
After the quick-fix is applied:
<%@page contentType="text/html; ISO-8859-1" %>
<a href="${pageContext.request.contextPath}/hey.jsp">hey</a>