Update roadmap node

src/data/roadmaps/postgresql-dba/content/100-roadmap-note.md

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 # Important Note
 
-If you are just a beginner trying to learn PostgreSQL, don't get discouraged by looking at the content of this roadmap. It is designed for people who are already familiar with PostgreSQL. Just learn some basics of PostgreSQL and then come back to this roadmap when you are ready to skill up and learn more advanced topics. 
+If you are just a beginner trying to learn PostgreSQL, don't get discouraged by looking at the content of this roadmap. It is designed for people who are already familiar with PostgreSQL. Just learn some basics of PostgreSQL and then come back to this roadmap when you are ready to skill up and learn more advanced topics.
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+Also, note that the roadmap topics contain some introductory content that is meant to help you get started with the topic. You may have to do some research on your own to learn more about the topic.
 
 If you are a beginner, you can start with the following resources: