Fix struct sequence glossary entry grammar (GH-9030)


... by removing a superfluous "either".

Reported by Никита Люшненко on docs@.
(cherry picked from commit 98b976a2f82ba5f50cf6846338f644ca6c64f47d)

Co-authored-by: Zachary Ware <zachary.ware@gmail.com>
1 file changed