Merge pull request #17415 from flyingSquirrel-dev/patch-1

Fix typo in presets docs

docs/addons/writing-presets.md

@@ -194,7 +194,7 @@ If it doesn't exist yet, create a file `.storybook/main.js`:
 
 ### Preview/Manager templates
 
-It's also possible to to programmatically modify the preview head/body HTML using a preset, similar to the way `preview-head.html`/`preview-body.html` can be used to [configure story rendering](../configure/story-rendering.md). The `previewHead` and `previewBody` functions accept a string, which is the existing head/body, and return a modified string.
+It's also possible to programmatically modify the preview head/body HTML using a preset, similar to the way `preview-head.html`/`preview-body.html` can be used to [configure story rendering](../configure/story-rendering.md). The `previewHead` and `previewBody` functions accept a string, which is the existing head/body, and return a modified string.
 
 For example, the following snippet adds a style tag to the preview head programatically: