[2.7] Fix struct sequence glossary entry grammar (GH-9030)
... by removing a superfluous "either".
Reported by Никита Люшненко on docs@
(cherry picked from commit 98b976a2f82ba5f50cf6846338f644ca6c64f47d)
diff --git a/Doc/glossary.rst b/Doc/glossary.rst
index 34c71c6..9e6bf23 100644
--- a/Doc/glossary.rst
+++ b/Doc/glossary.rst
@@ -710,7 +710,7 @@
struct sequence
A tuple with named elements. Struct sequences expose an interface similiar
- to :term:`named tuple` in that elements can either be accessed either by
+ to :term:`named tuple` in that elements can be accessed either by
index or as an attribute. However, they do not have any of the named tuple
methods like :meth:`~collections.somenamedtuple._make` or
:meth:`~collections.somenamedtuple._asdict`. Examples of struct sequences