Update project visibility permissions in docs

doc/api/projects.md

@@ -19,6 +19,8 @@ Values for the project visibility level are:
 - `internal`: the project can be cloned by any signed-in user except [external users](../user/permissions.md#external-users).
 - `public`: the project can be accessed without any authentication.
 
+For more, read [Project visibility](../public_access/public_access.md).
+
 ## Project merge method
 
 There are three options for `merge_method` to choose from:

doc/public_access/public_access.md

@@ -55,8 +55,15 @@ They appear in the public access directory (`/public`) for project members only.
 
 ## Change project visibility
 
-1. Go to your project's **Settings**.
-1. Change **Visibility Level** to either Public, Internal, or Private.
+Prerequisite:
+
+- You must have the Owner role for a project.
+
+1. On the top bar, select **Menu > Projects** and find your project.
+1. On the left sidebar, select **Settings > General**.
+1. Expand **Visibility, project features, permissions**.
+1. Change **Project visibility** to either Public, Internal, or Private.
+1. Select **Save changes**.
 
 ## Restrict use of public or internal projects