Fix the incorrect links

Signed-off-by: yuexiao-wang <wang.yuexiao@zte.com.cn>

docs/reference/commandline/image_prune.md

@@ -61,5 +61,5 @@ Total reclaimed space: 16.43 MB
 
 * [system df](system_df.md)
 * [container prune](container_prune.md)
-* [volume prune](container_prune.md)
+* [volume prune](volume_prune.md)
 * [system prune](system_prune.md)

docs/reference/commandline/system_prune.md

@@ -66,5 +66,5 @@ Total reclaimed space: 13.5 MB
 * [Understand Data Volumes](../../tutorials/dockervolumes.md)
 * [system df](system_df.md)
 * [container prune](container_prune.md)
-* [image prune](container_prune.md)
+* [image prune](image_prune.md)
 * [system prune](system_prune.md)

docs/reference/commandline/volume_prune.md

@@ -44,5 +44,5 @@ Total reclaimed space: 36 B
 * [Understand Data Volumes](../../tutorials/dockervolumes.md)
 * [system df](system_df.md)
 * [container prune](container_prune.md)
-* [image prune](container_prune.md)
+* [image prune](image_prune.md)
 * [system prune](system_prune.md)