docs(kconfig): Updated config name lenght

docs/en/api-reference/kconfig.rst

@@ -33,7 +33,7 @@ Format rules for Kconfig files are as follows:
 - Option names in any menus should have consistent prefixes. The prefix currently should have at least 3 characters.
 - The unit of indentation should be 4 spaces. All sub-items belonging to a parent item are indented by one level deeper. For example, ``menu`` is indented by 0 spaces, ``config``  ``menu`` by 4 spaces, ``help`` in ``config`` by 8 spaces, and the text under ``help`` by 12 spaces.
 - No trailing spaces are allowed at the end of the lines.
-- The maximum length of options is 40 characters.
+- The maximum length of options is 50 characters.
 - The maximum length of lines is 120 characters.
 
 .. note::

docs/zh_CN/api-reference/kconfig.rst

@@ -33,7 +33,7 @@ Kconfig 文件的格式规定如下：
 - 在所有菜单中，选项名称的前缀需保持一致。目前，前缀长度应为至少 3 个字符。
 - 每级采用 4 个空格的缩进方式，子项需比父项多缩进一级。例如， ``menu`` 缩进 0 个空格，``menu`` 中的 ``config`` 则缩进 4 个空格， ``config`` 中的 ``help`` 缩进 8 个空格， ``help`` 下的文本缩进 12 个空格。
 - 行末不得出现尾随空格。
-- 选项最长为 40 个字符。
+- 选项最长为 50 个字符。
 - 每行最长为 120 个字符。
 
 .. note::