Update tools.adoc , change colon to semicolon (#2741)

Signed-off-by: 可能 <contact@revengemission.com>

spring-ai-docs/src/main/antora/modules/ROOT/pages/api/tools.adoc

@@ -254,7 +254,7 @@ ChatModel chatModel = ...
 ToolCallback[] dateTimeTools = ToolCallbacks.from(new DateTimeTools());
 ChatOptions chatOptions = ToolCallingChatOptions.builder()
     .toolCallbacks(dateTimeTools)
-    .build():
+    .build();
 Prompt prompt = new Prompt("What day is tomorrow?", chatOptions);
 chatModel.call(prompt);
 ----