Image filters: ensure Grayscale is a level-2 heading

The `images.Grayscale` function was previously tagged as an h3, leading to its omission from the righthand navigation.
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Mark A. Matienzo authored and Bjørn Erik Pedersen committed 2021-12-30 10:13:48 +01:00
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@@ -128,7 +128,7 @@ images.GaussianBlur SIGMA
GaussianBlur creates a filter that applies a gaussian blur to an image. GaussianBlur creates a filter that applies a gaussian blur to an image.
### Grayscale ## Grayscale
{{% funcsig %}} {{% funcsig %}}
images.Grayscale images.Grayscale