Allow markdownlint to run locally (#36398)

Signed-off-by: Harry Mellor <19981378+hmellor@users.noreply.github.com>

tools/pre_commit/generate_attention_backend_docs.py

@@ -1153,11 +1153,11 @@ def _render_table(
 ) -> list[str]:
     """Render a markdown table from column specs and backend data."""
     header = "| " + " | ".join(name for name, _ in columns) + " |"
-    sep = "|" + "|".join("-" * (len(name) + 2) for name, _ in columns) + "|"
+    sep = "| " + " | ".join("-" * len(name) for name, _ in columns) + " |"
     lines = [header, sep]
     for info in sorted(backends, key=_sort_key):
         row = "| " + " | ".join(fmt(info) for _, fmt in columns) + " |"
-        lines.append(row)
+        lines.append(row.replace("  ", " "))
     return lines
 
 
@@ -1268,7 +1268,7 @@ def _priority_table(title: str, backends: list[str]) -> list[str]:
         f"**{title}:**",
         "",
         "| Priority | Backend |",
-        "|----------|---------|",
+        "| -------- | ------- |",
         *[f"| {i} | `{b}` |" for i, b in enumerate(backends, 1)],
         "",
     ]
@@ -1317,7 +1317,7 @@ def generate_legend() -> str:
     return """## Legend
 
 | Column | Description |
-|--------|-------------|
+| ------ | ----------- |
 | **Dtypes** | Supported model data types (fp16, bf16, fp32) |
 | **KV Dtypes** | Supported KV cache data types (`auto`, `fp8`, `fp8_e4m3`, etc.) |
 | **Block Sizes** | Supported KV cache block sizes (%N means multiples of N) |
@@ -1348,7 +1348,7 @@ def generate_mla_section(
         "configuration.",
         "",
         "| Backend | Description | Compute Cap. | Enable | Disable | Notes |",
-        "|---------|-------------|--------------|--------|---------|-------|",
+        "| ------- | ----------- | ------------ | ------ | ------- | ----- |",
     ]
 
     for backend in prefill_backends:
@@ -1360,7 +1360,7 @@ def generate_mla_section(
             backend["disable"],
             backend.get("notes", ""),
         )
-        lines.append(row)
+        lines.append(row.replace("  ", " "))
 
     lines.extend(
         [