Fixed a few single-letter variable names

Author: Bart Koelman

src/Examples/JsonApiDotNetCoreExample/Definitions/ArticleHooksDefinition.cs

@@ -29,7 +29,7 @@ public override IEnumerable<Article> OnReturn(HashSet<Article> resources, Resour
                 });
             }
 
-            return resources.Where(t => t.Caption != "This should not be included");
+            return resources.Where(article => article.Caption != "This should not be included");
         }
     }
 }

src/Examples/JsonApiDotNetCoreExample/Definitions/PassportHooksDefinition.cs

@@ -36,7 +36,7 @@ public override void BeforeImplicitUpdateRelationship(IRelationshipsDictionary<P
 
         public override IEnumerable<Passport> OnReturn(HashSet<Passport> resources, ResourcePipeline pipeline)
         {
-            return resources.Where(p => !p.IsLocked);
+            return resources.Where(passport => !passport.IsLocked);
         }
     }
 }

src/Examples/JsonApiDotNetCoreExample/Definitions/TagHooksDefinition.cs

@@ -18,7 +18,7 @@ public TagHooksDefinition(IResourceGraph resourceGraph)
 
         public override IEnumerable<Tag> OnReturn(HashSet<Tag> resources, ResourcePipeline pipeline)
         {
-            return resources.Where(t => t.Name != "This should not be included");
+            return resources.Where(tag => tag.Name != "This should not be included");
         }
     }
 }

src/Examples/JsonApiDotNetCoreExample/Definitions/TodoItemHooksDefinition.cs

@@ -37,7 +37,7 @@ public override void BeforeImplicitUpdateRelationship(IRelationshipsDictionary<T
 
         public override IEnumerable<TodoItem> OnReturn(HashSet<TodoItem> resources, ResourcePipeline pipeline)
         {
-            return resources.Where(t => t.Description != "This should not be included");
+            return resources.Where(todoItem => todoItem.Description != "This should not be included");
         }
     }
 }