name typo correction - volunteers on tables and field

[bltMustafa]

v3 of DB Schema

Changes:

• volunteers typo fixes
• priority field added to volunteer_counts table

[9ssi7]

Can you pass enum values for source type? We need this in the init.sql command. @bltMustafa

[9ssi7]

and I request the following name changes in the sources table:

old | new
adi => name,
tip => type

[9ssi7]

merged in #15