CFINSPEC-82: Remove ppa resource deprecation for backward compatibility

Signed-off-by: Sonu Saha <sonu.saha@progress.com>

etc/deprecations.json

@@ -83,11 +83,6 @@
       "suffix": "This resource was removed in InSpec 4.0.",
       "comment": "Needed for ServerSpec compatibility"
     },
-    "resource_ppa": {
-      "action": "exit",
-      "suffix": "This resource was removed in InSpec 4.0.",
-      "comment": "Needed for ServerSpec compatibility"
-    },
     "resource_script": {
       "action": "exit",
       "suffix": "This resource will be removed in InSpec 4.0"

lib/inspec/resources/apt.rb

@@ -135,19 +135,25 @@ module Inspec::Resources
 
   class PpaRepository < AptRepository
     name "ppa"
+    desc "Use the ppa InSpec audit resource to verify PPA repositories on the Debian-based linux platforms."
+    example <<~EXAMPLE
+      describe ppa('ubuntu-wine/ppa') do
+        it { should exist }
+        it { should be_enabled }
+      end
+    
+      describe ppa('ppa:ubuntu-wine/ppa') do
+        it { should exist }
+        it { should be_enabled }
+      end
+    EXAMPLE
 
     def exists?
-      deprecated
       super()
     end
 
     def enabled?
-      deprecated
       super()
     end
-
-    def deprecated
-      Inspec.deprecate(:resource_ppa, "The `ppa` resource is deprecated. Please use `apt`")
-    end
   end
 end