message: docs: fix alt text sponsors
diff: v-for="sponsor in list"
  :key="sponsor.href"
  :href="sponsor.href"
  + :title="sponsor.alt"
  target="_blank"
  rel="sponsored noopener"
  :style="{ width: size + 'px' }"
  >
  - <img :src="sponsor.imgSrcLight" :style="{ width: size + 'px' }" />
  + <img
  + :src="sponsor.imgSrcLight"
  + :alt="sponsor.alt"
  + :style="{ width: size + 'px' }"
  + />
  </a>
  <br />
  <br />
  