[src/gc] Improve function-level documentation with imperative mood and better POD. Suggestion by chromatic++
[src/gc] Improve function-level documentation with imperative mood and better POD. Suggestion by chromatic++

git-svn-id: 6e74a02f85675cec270f5d931b0f6998666294a3@28680 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot