Correct Java snippet rendering in Hello World tutorial

[theejazz]

This PR corrects a rendering error for a Java snippet from the Hello World tutorial. Specifically, versions 2.8.2 and 2.8.x of the Play Application Overview provide the following Java code:

public Result index() {
       return ok(views.html.index.render("Your new application is
  return ok(javaguide.hello.html.index.render("Your new application is ready.", assetsFinder));
}

which is meaningless and won't compile.

The problem is caused by the ###replace: directive from the PlayDoc library. Its purpose is to replace the code underneath the directive with the code directly after the directive. However, it cannot handle newlines within its input, so this fix turns it into a one-liner.

It might be useful to extend the PlayDoc with multiline replace directives if they get more future use, but this is a much more reasonable fix for now.

Lastly, I slightly changed the spacing between ###replace: and the code snippet to be replaced. It now aligns with the other replace directives in the file.

Cheers

[ignasi35]

@Mergifyio backport master

[mergify]

Command backport master: pending

Waiting for the pull request to get merged

[ignasi35]

The build fails because the java formatter splits the comment into shorter lines:

   public Result index() {
-    // ###replace:     return ok(views.html.index.render("Your new application is ready.", assetsFinder));
+    // ###replace:     return ok(views.html.index.render("Your new application is ready.",
+    // assetsFinder));
     return ok(javaguide.hello.html.index.render("Your new application is ready.", assetsFinder));
   }

[octonato]

Thanks @theejazz

This is already fixed in #10789, so I'm closing this PR.