fix(readme): use bold text for Markdown and HTML in HTML conversation section

Author: EchoEllet

README.md

@@ -277,9 +277,8 @@ work as expected**, due to differences between **HTML** and **Delta**, see
 The following packages can be used:
 
 1. [`vsc_quill_delta_to_html`](https://pub.dev/packages/vsc_quill_delta_to_html): To convert **Delta**
-   to HTML.
-2. [`flutter_quill_delta_from_html`](https://pub.dev/packages/flutter_quill_delta_from_html): To Convert **HTML** to *
-   *Delta**.
+   to **HTML**.
+2. [`flutter_quill_delta_from_html`](https://pub.dev/packages/flutter_quill_delta_from_html): To convert **HTML** to **Delta**.
 3. [`flutter_quill_to_pdf`](https://pub.dev/packages/flutter_quill_to_pdf): To convert **Delta** To **PDF**.
 4. [`markdown_quill`](https://pub.dev/packages/markdown_quill): To convert **Markdown** To **Delta** and vice versa.