Updates README-en.md

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     ```
    Its purpose is to associate the object called `file` with the data file `dvd_csv.txt`. When openning a data file in a program it is often necessary to specify the file's absolute path to guarantee that it is found regardless of where the executable is placed. Find out the **absolute path** of `dvd_csv.txt` and substitute it for the current `"dvd_csv.txt"` string. For example, after the change the line could look as follows:
     ```cpp
-    filemanip file("/home/eip/dvddvd_csv.txt") ;
+    filemanip file("/home/eip/functions-dvdinfo/dvd_csv.txt") ;
     ```
 
 1. Perform the following implementations in the `main` function (in the `main.cpp` file):