fix typo

README.md

@@ -35,7 +35,7 @@ theme = [ "hugo-sustain", "hugo-snap-gallery" ]
 Specifying your image files:
 
 - `{{< figure src="image.jpg" >}}` will just show the image with no caption, and open the full version of it when clicked
-- `{{< figure src="image.jpg" capation="My description" >}}` will show the image and open the full version of it when clicked, and shows the caption text in both views. Markdown is possible
+- `{{< figure src="image.jpg" caption="My description" >}}` will show the image and open the full version of it when clicked, and shows the caption text in both views. Markdown is possible
 - `{{< figure src="image.jpg" link="http://example.com" >}}` will use `image.jpg` for thumbnail and link to `http://example.com` when clicked
 
 Optional parameters: