Remove deprecated Mamba flags from doc, wrong FP8 GEMM docstrings and change Nemotron image to 0.5.15 (#31094)

Co-authored-by: Brayden Zhong <brayden@radixark.ai>

docs_new/docs/hardware-platforms/ascend-npus/ascend_npu_support_features.mdx

@@ -1779,7 +1779,7 @@ If the value is int8, you must also set the environment variable:DEEP_NORMAL_MOD
       <td style={{padding: "9px 12px", backgroundColor: "rgba(255,255,255,0.05)"}}>A2, A3</td>
     </tr>
     <tr>
-      <td style={{padding: "9px 12px", fontWeight: 500, backgroundColor: "rgba(255,255,255,0.02)"}}>`--mamba-scheduler-strategy`</td>
+      <td style={{padding: "9px 12px", fontWeight: 500, backgroundColor: "rgba(255,255,255,0.02)"}}>`--mamba-radix-cache-strategy`</td>
       <td style={{padding: "9px 12px", backgroundColor: "rgba(255,255,255,0.05)"}}>`auto`</td>
       <td style={{padding: "9px 12px", backgroundColor: "rgba(255,255,255,0.02)"}}>`auto`,<br/>`no_buffer`,<br/>`extra_buffer`</td>
       <td style={{padding: "9px 12px", backgroundColor: "rgba(255,255,255,0.05)"}}>A2, A3</td>

docs_new/docs/hardware-platforms/ascend-npus/best_practice/qwen3_5_397b.mdx

@@ -320,7 +320,7 @@ python3 -m sglang.launch_server \
     --max-prefill-tokens 131072 \
     --max-mamba-cache-size 320 \
     --prefill-max-requests 10 \
-    --mamba-scheduler-strategy extra_buffer \
+    --mamba-radix-cache-strategy extra_buffer \
     --trust-remote-code \
     --max-running-requests 64 \
     --mem-fraction-static 0.6 \
@@ -1110,7 +1110,7 @@ python3 -m sglang.launch_server \
     --chunked-prefill-size -1 \
     --max-prefill-tokens 65536 \
     --max-mamba-cache-size 640 \
-    --mamba-scheduler-strategy extra_buffer \
+    --mamba-radix-cache-strategy extra_buffer \
     --trust-remote-code \
     --max-running-requests 128 \
     --mem-fraction-static 0.6 \

docs_new/docs/hardware-platforms/ascend-npus/best_practice/qwen3_6_27b.mdx

@@ -284,7 +284,7 @@ python3 -m sglang.launch_server \
     --device npu \
     --chunked-prefill-size 32768 \
     --max-prefill-tokens 32768 \
-    --mamba-scheduler-strategy extra_buffer \
+    --mamba-radix-cache-strategy extra_buffer \
     --trust-remote-code \
     --max-running-requests 20 \
     --max-mamba-cache-size 160 \

docs_new/docs/hardware-platforms/ascend-npus/best_practice/qwen3_6_35b_a3b.mdx

@@ -389,7 +389,7 @@ python3 -m sglang.launch_server \
     --max-prefill-tokens 65536 \
     --trust-remote-code \
     --enable-prefill-delayer \
-    --mamba-scheduler-strategy extra_buffer \
+    --mamba-radix-cache-strategy extra_buffer \
     --max-running-requests 103 \
     --max-mamba-cache-size 85 \
     --mem-fraction-static 0.85 \
@@ -780,7 +780,7 @@ python3 -m sglang.launch_server \
     --max-total-tokens 470784 \
     --max-prefill-tokens 65536 \
     --trust-remote-code \
-    --mamba-scheduler-strategy extra_buffer \
+    --mamba-radix-cache-strategy extra_buffer \
     --max-running-requests 40 \
     --max-mamba-cache-size 200 \
     --mem-fraction-static 0.9 \