fix：remove code completion

Author: iamStephenFang

PlaygroundBook/Chapters/Chapter1.playgroundchapter/Pages/Page1.playgroundpage/Manifest.plist

@@ -8,5 +8,7 @@
 	<true/>
 	<key>LiveViewMode</key>
 	<string>VisibleByDefault</string>
+	<key>PlaygroundLoggingMode</key>
+	<string>Off</string>
 </dict>
 </plist>

PlaygroundBook/Chapters/Chapter1.playgroundchapter/Pages/Page2.playgroundpage/main.swift

@@ -11,7 +11,7 @@
 //:
 //: Suppose you want to know the capital of China, through the triplet "China-Capital-Beijing" you can easily get the answer to the question with other entities information related to Beijing, it is similar to the behavior when you search for the capital of China in the online search engine. In fact, many search engines use knowledge graph-related techniques.
 //: ## Storage methods of Knowledge Graph
-//: To help you understand the knowledge graph in a simple way, a basic simulation of the structure of the knowledge graph is given in this playground. In real scenarios, there are two main methods to store the knowledge graph.
+//: To help you understand the knowledge graph in a easy way, a basic simulation of the structure of the knowledge graph is given in this playground. In the actual production environment, there are two main methods to store the knowledge graph.
 //:
 //: **RDF** RDF stands for Resource Description Framework and it’s a W3C standard for data exchange in the Web. RDF consists of nodes and edges. Nodes represent entities and resources, attributes, while edges represent the relationship between entities and entities, as well as the relationship between entities and attributes.
 //:

PlaygroundBook/Chapters/Chapter1.playgroundchapter/Pages/Page3.playgroundpage/Manifest.plist

@@ -8,5 +8,7 @@
 	<true/>
 	<key>LiveViewMode</key>
 	<string>VisibleByDefault</string>
+	<key>PlaygroundLoggingMode</key>
+	<string>Off</string>
 </dict>
 </plist>

PlaygroundBook/Chapters/Chapter1.playgroundchapter/Pages/Page3.playgroundpage/main.swift

@@ -22,12 +22,6 @@ import BookCore
 import PlaygroundSupport
 var userGraph: (Graph) -> Graph = { graph in
 //#-end-hidden-code
-//#-code-completion(everything, hide)
-//#-code-completion(identifier, show, graph.addEntity(_ entity: Entity))
-//#-code-completion(identifier, show, graph.addEntities(_ entitiesToAdd: [Entity]))
-//#-code-completion(identifier, show, graph.addRelation(_ entity: Entity, to anotherEntity: Entity, relation: String))
-//#-code-completion(identifier, show, graph.updateRelation(_ firstEntity: Entity, to secondEntity: Entity, relation: String))
-//#-code-completion(identifier, show, graph.deleteEntity(_ entityToDelete: EntityID))
 //#-editable-code
     let Apple = Entity(text: "Apple")
     let Fruit = Entity(text: "Fruit")

PlaygroundBook/Modules/BookCore.playgroundmodule/Sources/Model/Graph.swift

@@ -102,22 +102,22 @@ extension Graph {
       edges = newSet
     }
 
-    public func addRelation(_ entity: Entity, to anotherEntity: Entity, relation: String){
+    public func addRelation(_ entity: Entity, to secondEntity: Entity, relation: String){
         let center = entity.position
         let radius = 300.0
         let angle = CGFloat.random(in: 1.0..<360.0) * CGFloat.pi/180.0
         let point = CGPoint(x: center.x + CGFloat(radius) * cos(angle), y: center.y + CGFloat(radius) * sin(angle))
 
-        self.positionEntity(anotherEntity, position: point)
-        connect(entity, to: anotherEntity, relation: relation)
+        self.positionEntity(secondEntity, position: point)
+        connect(entity, to: secondEntity, relation: relation)
         rebuildLinks()
     }
 
     public func deleteEntity(_ entity: Entity) {
       deleteEntity(entity.id)
     }
 
-    public func updateEntity(_ entity: Entity, text: String) {
+    func updateEntity(_ entity: Entity, text: String) {
       var newEntity = entity
       newEntity.text = text
       replace(entity, with: newEntity)
@@ -190,5 +190,3 @@ extension Graph {
         return answerEntity?.text ?? ""
     }
 }
-
-