mysql updated to avoid warnings on new nodejs

[VeronikaLee]

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[ghost]

Update text (and solution info where relevant) to show new terminal output for the shell

• 4. 1. Foreign key
• 5. 2. Challenge
• 5. 3. Challenge
• 6. 1. SQL inner join
• 7. 1. SQL left outer join
• 8. SQL right outer join
• 9. Joining specific columns
• 10. 1. Updating the table
• 10. 2. Alter table in detail
• 10. 3. Challenge

mysql command run on open tabs when shell is already running causing problem
6. SQL inner join

Update text
4. 1. Foreign key
MUL shown. should be NULL ?

Needed to reset section database before challenge would pass
5. 3. Challenge
10. 3. Challenge
11. 3. Challenge