DOC FIX Comment about init of LoRA Embedding (#1855)

Fixes #1728

src/peft/tuners/lora/layer.py

@@ -148,7 +148,8 @@ def reset_lora_parameters(self, adapter_name, init_lora_weights):
  raise ValueError(f"Unknown initialization {init_lora_weights=}")
  nn.init.zeros_(self.lora_B[adapter_name].weight)
  if adapter_name in self.lora_embedding_A.keys():
- # initialize a the same way as the default for nn.linear and b to zero
+ # Initialize A to zeros and B the same way as the default for nn.Embedding, see:
+ # https://github.com/microsoft/LoRA/blob/4c0333854cb905966f8cc4e9a74068c1e507c7b7/loralib/layers.py#L59-L60
  nn.init.zeros_(self.lora_embedding_A[adapter_name])
  nn.init.normal_(self.lora_embedding_B[adapter_name])