[3.15] gh-156111: Clarify wording in glossary entry "expression" (GH-156198) (#156236)

gh-156111: Clarify wording in glossary entry "expression" (GH-156198)
(cherry picked from commit 6f42535)

Co-authored-by: Aniket <148300120+Aniketsy@users.noreply.github.com>

Author: miss-islington

Doc/glossary.rst

@@ -509,7 +509,7 @@ Glossary
       A piece of syntax which can be evaluated to some value.  In other words,
       an expression is an accumulation of expression elements like literals,
       names, attribute access, operators or function calls which all return a
-      value.  In contrast to many other languages, not all language constructs
+      value.  Not all language constructs
       are expressions.  There are also :term:`statement`\s which cannot be used
       as expressions, such as :keyword:`while`.  Assignments are also statements,
       not expressions.