Update CHANGELOG.md for v8.1.1 [skip ci]

CHANGELOG.md

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+## 8.1.1
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+- Docgen: Only add react-docgen info when a component is defined in the file - [#26967](https://github.com/storybookjs/storybook/pull/26967), thanks @glenjamin!
+- Docs: Fix MDX Stories block tag-filtering behavior - [#27144](https://github.com/storybookjs/storybook/pull/27144), thanks @shilman!
+- Docs: Fix Subtitle block when no `of` prop passed - [#27147](https://github.com/storybookjs/storybook/pull/27147), thanks @JReinhold!
+- Next.js: Add typing for NextImage to main framework options type - [#27105](https://github.com/storybookjs/storybook/pull/27105), thanks @valentinpalkovic!
+- Next.js: Avoid conflicts with the raw loader - [#27093](https://github.com/storybookjs/storybook/pull/27093), thanks @seanparmelee!
+- Types: Fix typing for main.framework/builder fields - [#27088](https://github.com/storybookjs/storybook/pull/27088), thanks @valentinpalkovic!
+
 ## 8.1.0
 
 Storybook 8.1 is here with a tone of new features and bug fixes: