docs: Fix typo and few grammatical issues

[WebDevCode]

Please describe the changes this PR makes and why it should be merged:

1. Fixed Typo in website/components/back-in-block/vdom.tsx
2. Fixed few prepositions and other grammatical issues in website/pages/blog/virtual-dom.mdx

Status

• [x] Code changes have been tested against prettier, or there are no code changes
• [ ] I know how to update typings and have done so, or typings don't need updating

Semantic versioning classification:

• [ ] This PR changes the codebase
  • [ ] This PR includes breaking changes (methods removed or renamed, parameters moved or removed)
  • [ ] This PR changes the internal workings with no modifications to the external API (bug fixes, performance improvements)
• [x] This PR only includes non-code changes, like changes to documentation, README, etc.

[WebDevCode]

I hope I was able to follow the instructions in the contributing guide. This is officially my first pull request 😄

[aidenybai]

LGTM