update pdf links

Author: cabbetlong

content/en/docs/_index.md

@@ -7,6 +7,6 @@ weight: 20
 
 You can get the PDF version of the user guide from the following link：
 
-<a class="btn btn-lg btn-secondary me-3 mb-4" href="https://github.com/Huawei/eSDK_K8S_Plugin/blob/master/docs/eSDK%20Huawei%20Storage%20Kubernetes%20CSI%20Plugins%20V4.5.0%20User%20Guide%2002.pdf">
+<a class="btn btn-lg btn-secondary me-3 mb-4" href="https://github.com/Huawei/eSDK_K8S_Plugin/blob/v4.5/docs/eSDK%20Huawei%20Storage%20Kubernetes%20CSI%20Plugins%20V4.5.0%20User%20Guide%2002.pdf">
   PDF Download <i class="fa-solid fa-file-pdf"></i>
 </a>

content/zh-cn/docs/_index.md

@@ -7,6 +7,6 @@ weight: 20
 
 您可以通过以下链接，获取PDF版用户指南：
 
-<a class="btn btn-lg btn-secondary me-3 mb-4" href="https://github.com/Huawei/eSDK_K8S_Plugin/blob/master/docs/eSDK%20Huawei%20Storage%20Kubernetes%20CSI%20Plugins%20V4.5.0%20%E7%94%A8%E6%88%B7%E6%8C%87%E5%8D%97%2002.pdf">
+<a class="btn btn-lg btn-secondary me-3 mb-4" href="https://github.com/Huawei/eSDK_K8S_Plugin/blob/v4.5/docs/eSDK%20Huawei%20Storage%20Kubernetes%20CSI%20Plugins%20V4.5.0%20%E7%94%A8%E6%88%B7%E6%8C%87%E5%8D%97%2002.pdf">
   PDF下载 <i class="fa-solid fa-file-pdf"></i>
 </a>