docs(x_search): comment out reasoning_effort in sample config blocks

The copy-paste config sample had reasoning_effort: low active, which
would silently downshift effort for anyone pasting the block. Keep it
commented like other optional keys. Also add the contributor email
mapping for the salvage.

contributors/emails/valda68k@gmail.com

@@ -0,0 +1,2 @@
+valda
+# PR #61713 salvage

website/docs/user-guide/features/x-search.md

@@ -57,7 +57,7 @@ x_search:
   # Optional reasoning effort: low, medium, high, or xhigh. When omitted,
   # the selected model's default applies. xhigh is supported only by
   # models that document it, such as grok-4.20-multi-agent.
-  reasoning_effort: low
+  # reasoning_effort: low
 
   # Request timeout in seconds. x_search can take 60–120s for
   # complex queries — the default is generous. Minimum: 30.

website/i18n/zh-Hans/docusaurus-plugin-content-docs/current/user-guide/features/x-search.md

@@ -52,7 +52,7 @@ x_search:
 
   # 可选推理强度：low、medium、high 或 xhigh。省略时使用所选模型的默认值。
   # xhigh 仅适用于明确支持它的模型，例如 grok-4.20-multi-agent。
-  reasoning_effort: low
+  # reasoning_effort: low
 
   # 请求超时时间（秒）。复杂查询的 x_search 可能需要 60–120 秒，
   # 默认值较为宽松。最小值：30。