Apply suggestions from code review

Co-authored-by: Lambros Petrou <[email protected]>

Author: Oxyjun

src/content/partials/d1/d1-do-supported-sqlite-extensions.mdx

@@ -5,7 +5,8 @@ params:
 
 {props.product} a subset of SQLite extensions for added functionality, including:
 
-- [FTS5 module](https://www.sqlite.org/fts5.html) for full-text search.
-- [Maths functions](https://sqlite.org/lang_mathfunc.html).
+- [FTS5 module](https://www.sqlite.org/fts5.html) for full-text search (including `fts5vocab`).
+- [JSON extension](https://www.sqlite.org/json1.html) for JSON functions and operators.
+- [Math functions](https://sqlite.org/lang_mathfunc.html).
 
 Refer to the [source code](https://github.com/cloudflare/workerd/blob/4c42a4a9d3390c88e9bd977091c9d3395a6cd665/src/workerd/util/sqlite.c%2B%2B#L269) for the full list of supported functions.