Fix CI build error: add missing closing backtick in :ref: directive

Co-authored-by: josix <[email protected]>

Author: Copilot

glossary.po

@@ -2991,7 +2991,7 @@ msgid ""
 "<lexical>` (also called the *tokenizer*). Names, numbers, strings, "
 "operators, newlines and similar are represented by tokens."
 msgstr ""
-"原始碼的小單位，由 :ref:`詞法分析器 <lexical>`（也稱為 *標記器*）產生。名"
+"原始碼的小單位，由 :ref:`詞法分析器 <lexical>` （也稱為 *標記器*）產生。名"
 "稱、數字、字串、運算子、換行符號等都以記號表示。"
 
 #: ../../glossary.rst:1310