Fix incorrect text-shadow color name in API table (#2196)

`shadow-<color>` is used for box-shadow, the right name is
`text-shadow-<color>` according to
tailwindlabs/tailwindcss#17389.

Author: dcastil

src/docs/text-shadow.mdx

@@ -36,8 +36,8 @@ export const description = "Utilities for controlling the shadow of a text eleme
     ["text-shadow-current", "--tw-shadow-color currentColor;"],
     ["text-shadow-transparent", "--tw-shadow-color transparent;"],
     ...Object.entries(colors).map(([name, value]) => [
-      `shadow-${name}`,
-      `--tw-shadow-color var(--color-${name}); /* ${value} */`,
+      `text-shadow-${name}`,
+      `--tw-text-shadow-color var(--color-${name}); /* ${value} */`,
     ]),
   ]}
 />