[Doc][P/D] Fix MooncakeConnector's name (#5172)

### What this PR does / why we need it?
vLLM community has integrated their MooncakeConnector. The original
scripts will now find this MooncakeConnector instead of the one from
vLLM-Ascend. All scripts that involve using the MooncakeConnector need
to be modified to another name.

### Does this PR introduce _any_ user-facing change?
Yes, users need to use a new name to load vLLM-Ascend MooncakeConnector.

### How was this patch tested?
By CI.

- vLLM version: v0.12.0
- vLLM main:
ad32e3e19c

---------

Signed-off-by: nwpu-zxr <zhouxuerong2@huawei.com>

examples/offline_disaggregated_prefill_npu.py

@@ -50,7 +50,7 @@ def run_prefill(prefill_done, process_close):
     sampling_params = SamplingParams(temperature=0, top_p=0.95, max_tokens=1)
 
     ktc = KVTransferConfig(
-        kv_connector="MooncakeConnector",
+        kv_connector="MooncakeConnectorV1",
         kv_role="kv_producer",
         kv_port="30000",
         engine_id="0",
@@ -102,7 +102,7 @@ def run_decode(prefill_done):
     sampling_params = SamplingParams(temperature=0, top_p=0.95)
 
     ktc = KVTransferConfig(
-        kv_connector="MooncakeConnector",
+        kv_connector="MooncakeConnectorV1",
         kv_role="kv_consumer",
         kv_port="30100",
         engine_id="1",