copy over publish note from old doc

Author: devalog

fern/products/sdks/overview/php/publishing-to-packagist.mdx

@@ -61,7 +61,7 @@ you'll have a versioned package published on Packagist.
 
 	  <Step title="Add repository location">
 
-	  Remove the auto-generated `output`, `location`, and `path` fields. Instead, add the path to your GitHub repository: 
+	  PHP publishes via Git repositories, so remove the auto-generated `output`, `location`, and `path` fields. Instead, add the path to your GitHub repository: 
 
 ```yaml {6-7}
 groups: