ci: update error reference docs

src/content/docs/en/reference/error-reference.mdx

@@ -47,6 +47,7 @@ The following reference is a complete list of the errors you may encounter while
 - [**PrerenderDynamicEndpointPathCollide**](/en/reference/errors/prerender-dynamic-endpoint-path-collide/)<br/>Prerendered dynamic endpoint has path collision.
 - [**ExpectedImage**](/en/reference/errors/expected-image/)<br/>Expected src to be an image.
 - [**ExpectedImageOptions**](/en/reference/errors/expected-image-options/)<br/>Expected image options.
+- [**IncompatibleDescriptorOptions**](/en/reference/errors/incompatible-descriptor-options/)<br/>Cannot set both `densities` and `widths`
 - [**ImageNotFound**](/en/reference/errors/image-not-found/)<br/>Image not found.
 - [**NoImageMetadata**](/en/reference/errors/no-image-metadata/)<br/>Could not process image metadata.
 - [**MarkdownImageNotFound**](/en/reference/errors/markdown-image-not-found/)<br/>Image not found.

src/content/docs/en/reference/errors/incompatible-descriptor-options.mdx

@@ -0,0 +1,24 @@
+---
+# NOTE: This file is auto-generated from 'scripts/error-docgen.mjs'
+# Do not make edits to it directly, they will be overwritten.
+# Instead, change this file: https://github.com/withastro/astro/blob/main/packages/astro/src/core/errors/errors-data.ts
+# Translators, please remove this note and the <DontEditWarning/> component.
+
+title: Cannot set both densities and widths
+i18nReady: true
+githubURL: https://github.com/withastro/astro/blob/main/packages/astro/src/core/errors/errors-data.ts
+---
+import DontEditWarning from '~/components/DontEditWarning.astro'
+
+<DontEditWarning />
+
+
+> **IncompatibleDescriptorOptions**: Only one of `densities` or `widths` can be specified. In most cases, you'll probably want to use only `widths` if you require specific widths.
+
+## What went wrong?
+Only one of `densities` or `widths` can be specified. Those attributes are used to construct a `srcset` attribute, which cannot have both `x` and `w` descriptors.
+
+**See Also:**
+-  [Images](/en/guides/images/)
+
+