fix: appropriate heading (#1173)

The section heading seems inappropriate, I've updated it to relate to
the section.

---------

Co-authored-by: Gar <[email protected]>

Author: andrewnessinjim

content/packages-and-modules/introduction-to-packages-and-modules/package-scope-access-level-and-visibility.mdx

@@ -10,7 +10,7 @@ Visibility of npm packages depends on the scope (namespace) in which the package
 
 </Note>
 
-## Public registry
+## npm Package Access Matrix
 
 | Scope | Access level | Can view and download | Can write (publish) |
 | --- | --- | --- | --- |