Do you mean the Common Library?
If not, don't worry about it. The Document Library is a part of the document itself, and changes from one document to the next. Any new document will have an empty Document Library, until you start creating or importing symbols. (Likewise, if you drag something from the Common Library onto the canvas of your document, it gets copied into the Document Library.)
Thank you! I must have misunderstood my class project. Back to the book!