plots: fix wrong link (#6693)

dvc/render/image.py

@@ -30,7 +30,6 @@ class ImageRenderer(Renderer):
         img_path = os.path.join(
             static, f"{revision}_{filename.replace(os.sep, '_')}"
         )
-        rel_img_path = relpath(img_path, page_dir_path)
         with open(img_path, "wb") as fd:
             fd.write(image_data)
         return """
@@ -38,7 +37,7 @@ class ImageRenderer(Renderer):
             <p>{title}</p>
             <img src="{src}">
         </div>""".format(
-            title=revision, src=rel_img_path
+            title=revision, src=(relpath(img_path, page_dir_path))
         )
 
     def _convert(self, path: "StrPath"):

dvc/render/vega.py

@@ -28,7 +28,7 @@ class PlotDataStructureError(DvcException):
     def __init__(self):
         super().__init__(
             "Plot data extraction failed. Please see "
-            "https://man.dvc.org/plot for supported data formats."
+            "https://man.dvc.org/plots for supported data formats."
         )