Revise error messages for mongo and mongodb handler configs

Author: jmikola

src/DependencyInjection/Configuration.php

@@ -891,7 +891,7 @@ private function addMongoSection(ArrayNodeDefinition $handlerNode)
                     ->ifTrue(function ($v) {
                         return !isset($v['id']) && !isset($v['host']);
                     })
-                    ->thenInvalid('What must be set is either the host or the id.')
+                    ->thenInvalid('The "mongo" handler configuration requires either a service "id" or a connection "host".')
                     ->end()
                     ->validate()
                     ->ifTrue(function ($v) {
@@ -903,7 +903,7 @@ private function addMongoSection(ArrayNodeDefinition $handlerNode)
             ->end()
             ->validate()
                 ->ifTrue(function ($v) { return 'mongo' === $v['type'] && !isset($v['mongo']); })
-                ->thenInvalid('The mongo configuration has to be specified to use a MongoDBHandler')
+                ->thenInvalid('The "mongo" configuration has to be specified to use a "mongo" handler type.')
             ->end()
         ;
     }
@@ -930,13 +930,13 @@ private function addMongoDBSection(ArrayNodeDefinition $handlerNode)
                         ->ifTrue(function ($v) {
                             return !isset($v['id']) && !isset($v['uri']);
                         })
-                        ->thenInvalid('What must be set is either the uri or the id.')
+                        ->thenInvalid('The "mongodb" handler configuration requires either a service "id" or a connection "uri".')
                     ->end()
                 ->end()
             ->end()
             ->validate()
                 ->ifTrue(function ($v) { return 'mongodb' === $v['type'] && !isset($v['mongodb']); })
-                ->thenInvalid('The mongodb configuration has to be specified to use a MongoDBHandler')
+                ->thenInvalid('The "mongodb" configuration has to be specified to use a "mongodb" handler type.')
             ->end()
         ;
     }