Update index.mdx

docs/introduction/index.mdx

@@ -15,7 +15,7 @@ import Typography from '@mui/material/Typography';
 
 *Neurosynth Compose* is *free to use* and helps users:
 
-* 🔎 **Search** across over 15,000 studies in the Neurosynth database, or import from external databasets such as PubMed.
+* 🔎 **Search** across over 20,000 studies in the Neurosynth database, or import from external databasets such as PubMed.
 * 🗃️ **Curate** your StudySet using systematic review tools conforming to the [PRISMA](https://www.prisma-statement.org/) guidelines.
 * 📝 **Extract** coordinates and metadata for each study, leveraging thousands of pre-extracted studies to minimize effort.
 * 📊 **Analyze** by specfying a reproducible [NiMARE](https://readthedocs.org/projects/nimare/) workflow, and execute it locally or in the cloud.