fix some typos : supported_head_sizes (#14627)

Author: hackty

vllm/attention/backends/blocksparse_attn.py

@@ -335,11 +335,11 @@ def __init__(
         self.sparse_block_size = self.blocksparse_params.block_size
         self.head_sliding_step = self.blocksparse_params.head_sliding_step
 
-        suppored_head_sizes = PagedAttention.get_supported_head_sizes()
-        if head_size not in suppored_head_sizes:
+        supported_head_sizes = PagedAttention.get_supported_head_sizes()
+        if head_size not in supported_head_sizes:
             raise ValueError(
                 f"Head size {head_size} is not supported by PagedAttention. "
-                f"Supported head sizes are: {suppored_head_sizes}.")
+                f"Supported head sizes are: {supported_head_sizes}.")
 
         self.tp_size = get_tensor_model_parallel_world_size()
         self.tp_rank = get_tensor_model_parallel_rank()