docs(astro): Elaborate on custom config paths (#11648)

Author: s1gr1d

docs/platforms/javascript/guides/astro/manual-setup.mdx

@@ -163,7 +163,8 @@ Sentry.init({
 
 ### Changing config files location
 
-To change the location of your `sentry.(client|server).config.js` files, specify the path to the files in the Sentry Astro integration options in your `astro.config.mjs`:
+Sentry automatically detects configuration files named `sentry.(client|server).config.js` in the root of your project. You can rename these files or move them to a custom folder within your project.
+To change their location or names, specify the paths in the Sentry Astro integration options in your `astro.config.mjs`:
 
 ```javascript {filename:astro.config.mjs}
 export default defineConfig({