[3.13] gh-129044: Update glossary entry for 'loader' to reflect current import system (GH-129073) (#129077)

gh-129044: Update glossary entry for 'loader' to reflect current import system (GH-129073)
(cherry picked from commit e1fa2fcc7c1bf5291a7f71300b7828b49be9ab72)

Co-authored-by: nikalinov <92603661+nikalinov@users.noreply.github.com>
Co-authored-by: Adam Turner <9087854+AA-Turner@users.noreply.github.com>