Some sub-chapters are duplicated in the same trail

A DESCRIPTION OF THE PROBLEM :
1- In the following link "https://docs.oracle.com/javase/tutorial/jdbc/overview/index.html", boths sub-chapters named "JDBC Architecture" and "A Relational Database Overview" are just duplicate and should be removed because the same (not exactly) contents exist in the same trail in the following links "https://docs.oracle.com/javase/tutorial/jdbc/overview/architecture.html" and "https://docs.oracle.com/javase/tutorial/jdbc/overview/database.html".

2- In the following link "https://docs.oracle.com/javase/tutorial/jdbc/overview/index.html", at the end of sub-chapter named "JDBC Product Components", the following sentence "This Trail uses the first two of these these four JDBC components to connect to a database" should be replaced by "This Trail uses the first two of these four JDBC components to connect to a database", because the word "these" is duplicated.


URL OF FAULTY DOCUMENTATION :
https://docs.oracle.com/javase/tutorial/jdbc/overview/index.html