Update Lesson 6

[abigailsparling]

How could the content be improved?

Split lesson 6 into basic and advanced. Move RDA helper and select records for edit to advanced. In Select records for edit section, add instruction to save before doing this work. Break out different edits as level two headings.

Which part of the content does your suggestion apply to?

https://librarycarpentry.org/lc-marcedit/06-manipulating-MARC-data.html

[abigailsparling]

Also make sure to update references lesson numbering after new lesson is added