[Server] Use getDescription to get all descriptions. (#188)

* Remove `getSummary` method and update descriptions in snapshots and code

* Add changelog entry

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Co-authored-by: Christopher Hertel <mail@christopher-hertel.de>

tests/Inspector/Http/snapshots/HttpCombinedRegistrationTest-resources_list.json

@@ -3,7 +3,7 @@
     {
       "name": "priority_config_discovered",
       "uri": "config://priority",
-      "description": "A resource discovered via attributes."
+      "description": "A resource discovered via attributes.\n\nThis will be overridden by a manual registration with the same URI."
     }
   ]
 }