GH-87002: fix caching documentation in struct module (#24164)

Author: uniq10-v1

Doc/library/struct.rst

@@ -548,9 +548,9 @@ The :mod:`struct` module also defines the following type:
    .. note::
 
       The compiled versions of the most recent format strings passed to
-      :class:`Struct` and the module-level functions are cached, so programs
-      that use only a few format strings needn't worry about reusing a single
-      :class:`Struct` instance.
+      the module-level functions are cached, so programs that use only a few
+      format strings needn't worry about reusing a single :class:`Struct`
+      instance.
 
    Compiled Struct objects support the following methods and attributes: