Update training & fine-tuning instructions

Author: Plachtaa

README.md

@@ -28,7 +28,7 @@ We have released 3 models for different purposes:
 | v1.0    | seed-uvit-whisper-base ([🤗](https://huggingface.co/Plachta/Seed-VC/blob/main/DiT_seed_v2_uvit_whisper_base_f0_44k_bigvgan_pruned_ft_ema.pth)[📄](configs/presets/config_dit_mel_seed_uvit_whisper_base_f0_44k.yml))       | Singing Voice Conversion (VC) | 44100         | Whisper-small   | BigVGAN | 768        | 17       | 200M   | strong zero-shot performance, singing voice conversion |
 
 Checkpoints of the latest model release will be downloaded automatically when first run inference.  
-If you are unable to access huggingface for network reason, try using mirror by adding `HF_ENDPOINT=https://hf-mirror.com/` before every command.
+If you are unable to access huggingface for network reason, try using mirror by adding `HF_ENDPOINT=https://hf-mirror.com` before every command.
 
 Command line inference:
 ```bash