Make newlines consistent across samples (#3001)

docs/serving/samples/hello-world/helloworld-kotlin/README.md

@@ -51,7 +51,7 @@ cd knative-docs/docs/serving/samples/hello-world/helloworld-kotlin
       embeddedServer(Netty, port.toInt()) {
           routing {
               get("/") {
-                  call.respondText("Hello $target!", ContentType.Text.Html)
+                  call.respondText("Hello $target!\n", ContentType.Text.Html)
               }
           }
       }.start(wait = true)

docs/serving/samples/hello-world/helloworld-kotlin/src/main/kotlin/com/example/hello/Main.kt

@@ -13,7 +13,7 @@ fun main(args: Array<String>) {
     embeddedServer(Netty, port.toInt()) {
         routing {
             get("/") {
-                call.respondText("Hello $target!", ContentType.Text.Html)
+                call.respondText("Hello $target!\n", ContentType.Text.Html)
             }
         }
     }.start(wait = true)

docs/serving/samples/hello-world/helloworld-nodejs/README.md

@@ -54,7 +54,7 @@ cd knative-docs/docs/serving/samples/hello-world/helloworld-nodejs
      console.log('Hello world received a request.');
 
      const target = process.env.TARGET || 'World';
-     res.send(`Hello ${target}!`);
+     res.send(`Hello ${target}!\n`);
    });
 
    const port = process.env.PORT || 8080;

docs/serving/samples/hello-world/helloworld-nodejs/index.js

@@ -5,7 +5,7 @@ app.get('/', (req, res) => {
   console.log('Hello world received a request.');
 
   const target = process.env.TARGET || 'World';
-  res.send(`Hello ${target}!`);
+  res.send(`Hello ${target}!\n`);
 });
 
 const port = process.env.PORT || 8080;

docs/serving/samples/hello-world/helloworld-php/README.md

@@ -33,7 +33,7 @@ cd knative-docs/docs/serving/samples/hello-world/helloworld-php
    ```php
    <?php
    $target = getenv('TARGET', true) ?: 'World';
-   echo sprintf("Hello %s!", $target);
+   echo sprintf("Hello %s!\n", $target);
    ```
 
 1. Create a file named `Dockerfile` and copy the code block below into it. See

docs/serving/samples/hello-world/helloworld-php/index.php

@@ -1,3 +1,3 @@
 <?php
 $target = getenv('TARGET', true) ?: 'World';
-echo sprintf("Hello %s!", $target);
+echo sprintf("Hello %s!\n", $target);