[Docs] reemove the incorrect enable_reasoning parameter (vllm-project#27550)

Signed-off-by: zxw <[email protected]>

Author: yyzxw

docs/features/tool_calling.md

@@ -321,7 +321,7 @@ Supported models:
 Flags:
 
 * For non-reasoning: `--tool-call-parser hunyuan_a13b`
-* For reasoning: `--tool-call-parser hunyuan_a13b --reasoning-parser hunyuan_a13b --enable_reasoning`
+* For reasoning: `--tool-call-parser hunyuan_a13b --reasoning-parser hunyuan_a13b`
 
 ### LongCat-Flash-Chat Models (`longcat`)