Fix typo in paragraph component documentation (#2552)

Fix the typo in the documentation for the paragraph component.

* Update the comment above the `backgroundPaint` initialization to "Create a background paint." in `docs/docs/text/paragraph.md`.

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Co-authored-by: William Candillon <[email protected]>

docs/docs/text/paragraph.md

@@ -123,7 +123,7 @@ const colors = [
 const MyParagraph = () => {
   const paragraph = useMemo(() => {
 
-    // Create a foreground paint.
+    // Create a background paint.
     const backgroundPaint = Skia.Paint();
     backgroundPaint.setShader(
       source.makeShader([0, 0, 256, 256, ...colors])