Fix Vale units issue in tooltips.mdx

Changed 'in pixels' to '(px)' to satisfy Microsoft.Units rule which flags 'in <unit>' without a numeral.

Addresses Vale comment on PR #1639

Co-Authored-By: Kapil Gowru <[email protected]>

Author: devin-ai-integration[bot]

fern/products/docs/pages/component-library/default-components/tooltips.mdx

@@ -149,7 +149,7 @@ const api = axios.create({
 </ParamField>
 
 <ParamField path="sideOffset" type="number" required={false} default={4}>
-  The distance between the tooltip and the trigger element, in pixels.
+  The distance between the tooltip and the trigger element (px).
 </ParamField>
 
 ## Styling