Fix curl examples to use GET with -d

Closes gh-1190

initializr-docs/src/main/asciidoc/configuration-guide.adoc

@@ -872,7 +872,7 @@ those two ids are displayed in the capabilities of the service):
 
 [source]
 ----
-$ curl http://localhost:8080/starter.zip -d dependencies=web,devtools \
+$ curl -G http://localhost:8080/starter.zip -d dependencies=web,devtools \
            -d bootVersion=2.3.5.RELEASE -o my-project.zip
 ----
 

initializr-web/src/main/resources/templates/cli/curl-examples.mustache

@@ -1,13 +1,13 @@
 To create a default demo.zip:
-	$ curl {{serviceUrl}}/starter.zip -o demo.zip
+	$ curl -G {{serviceUrl}}/starter.zip -o demo.zip
 
 To create a web project using Java 11:
-	$ curl {{serviceUrl}}/starter.zip -d dependencies=web \
+	$ curl -G {{serviceUrl}}/starter.zip -d dependencies=web \
 			-d javaVersion=11 -o demo.zip
 
 To create a web/data-jpa gradle project unpacked:
-	$ curl {{serviceUrl}}/starter.tgz -d dependencies=web,data-jpa \
+	$ curl -G {{serviceUrl}}/starter.tgz -d dependencies=web,data-jpa \
 		   -d type=gradle-project -d baseDir=my-dir | tar -xzvf -
 
 To generate a Maven POM with war packaging:
-	$ curl {{serviceUrl}}/pom.xml -d packaging=war -o pom.xml
+	$ curl -G {{serviceUrl}}/pom.xml -d packaging=war -o pom.xml

initializr-web/src/test/java/io/spring/initializr/web/support/CommandLineHelpGeneratorTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2021 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -88,7 +88,7 @@ class CommandLineHelpGeneratorTests {
 		assertThat(content).contains("id-b | depB");
 		assertThat(content).contains("https://fake-service");
 		assertThat(content).contains("Examples:");
-		assertThat(content).contains("curl https://fake-service");
+		assertThat(content).contains("curl -G https://fake-service");
 	}
 
 	@Test