[Doc][BugFix] Correct Kimi-K2.5 model name casing in deployment guides (vllm-project#12248)

### What this PR does / why we need it?
This PR corrects the casing of the Kimi-K2.5 model name from
`Kimi-K2.5-W4A8` to `Kimi-K2.5-w4a8` in the deployment commands within
the Kimi-K2.5 tutorial. This ensures that users copy-pasting the
commands do not encounter "model not found" errors due to case mismatch
with the actual model repository name.

Signed-off-by: wangzhishenghw <wangzhisheng6@h-partners.com>

Author: wangzhishenghw

docs/source/tutorials/models/Kimi-K2.5.md

@@ -146,7 +146,7 @@ export VLLM_ASCEND_ENABLE_MLAPO=1
 export VLLM_ASCEND_ENABLE_FLASHCOMM1=1
 export VLLM_ASCEND_BALANCE_SCHEDULING=1
 
-vllm serve Eco-Tech/Kimi-K2.5-W4A8 \
+vllm serve Eco-Tech/Kimi-K2.5-w4a8 \
   --host 0.0.0.0 \
   --port 8088 \
   --quantization ascend \
@@ -276,7 +276,7 @@ Run the following scripts on two nodes respectively.
     export VLLM_ASCEND_ENABLE_FLASHCOMM1=1
     export VLLM_ASCEND_BALANCE_SCHEDULING=1
 
-    vllm serve Eco-Tech/Kimi-K2.5-W4A8 \
+    vllm serve Eco-Tech/Kimi-K2.5-w4a8 \
     --host 0.0.0.0 \
     --port 8088 \
     --quantization ascend \
@@ -344,7 +344,7 @@ Run the following scripts on two nodes respectively.
     export VLLM_ASCEND_ENABLE_FLASHCOMM1=1
     export VLLM_ASCEND_BALANCE_SCHEDULING=1
 
-    vllm serve Eco-Tech/Kimi-K2.5-W4A8 \
+    vllm serve Eco-Tech/Kimi-K2.5-w4a8 \
     --host 0.0.0.0 \
     --port 8088 \
     --quantization ascend \
@@ -481,7 +481,7 @@ Parameter descriptions:
     export VLLM_ASCEND_ENABLE_FLASHCOMM1=1
     export ASCEND_RT_VISIBLE_DEVICES=$1
 
-    vllm serve Eco-Tech/Kimi-K2.5-W4A8 \
+    vllm serve Eco-Tech/Kimi-K2.5-w4a8 \
         --host 0.0.0.0 \
         --port $2 \
         --data-parallel-size $3 \
@@ -562,7 +562,7 @@ Parameter descriptions:
     export VLLM_ASCEND_ENABLE_FLASHCOMM1=1
     export ASCEND_RT_VISIBLE_DEVICES=$1
 
-    vllm serve Eco-Tech/Kimi-K2.5-W4A8 \
+    vllm serve Eco-Tech/Kimi-K2.5-w4a8 \
         --host 0.0.0.0 \
         --port $2 \
         --data-parallel-size $3 \
@@ -643,7 +643,7 @@ Parameter descriptions:
     export VLLM_ASCEND_ENABLE_MLAPO=1
     export ASCEND_RT_VISIBLE_DEVICES=$1
 
-    vllm serve Eco-Tech/Kimi-K2.5-W4A8 \
+    vllm serve Eco-Tech/Kimi-K2.5-w4a8 \
         --host 0.0.0.0 \
         --port $2 \
         --data-parallel-size $3 \
@@ -723,7 +723,7 @@ Parameter descriptions:
     export VLLM_ASCEND_ENABLE_MLAPO=1
     export ASCEND_RT_VISIBLE_DEVICES=$1
 
-    vllm serve Eco-Tech/Kimi-K2.5-W4A8 \
+    vllm serve Eco-Tech/Kimi-K2.5-w4a8 \
         --host 0.0.0.0 \
         --port $2 \
         --data-parallel-size $3 \