Rollup merge of #88659 - est31:update_smallvec_name, r=matthewjasper
Rollup merge of #88659 - est31:update_smallvec_name, r=matthewjasper

Remove SmallVector mention

SmallVector is long gone, as it's been first replaced
by OneVector in commit e5e6375352636360add297c1f5a1f37ce71506e9,
which then has been removed entirely in favour of SmallVec in
commit 130a32fa7259d348dc3a684b38e688da398c30bb.

graydon/rust,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,aidancully/rust,aidancully/rust,aidancully/rust,graydon/rust,graydon/rust,aidancully/rust,graydon/rust