git: openjdk/jdk-sandbox: simpleserver: add @since tags in the right places

[Julia Boes]

Changeset: c9d41727
Author:    Julia Boes <julia.boes at oracle.com>
Date:      2021-08-23 18:39:11 +0000
URL:       https://git.openjdk.java.net/jdk-sandbox/commit/c9d4172798257d70482db31c8bfcb16db55e0348

add @since tags in the right places

! src/jdk.httpserver/share/classes/com/sun/net/httpserver/Headers.java
! src/jdk.httpserver/share/classes/com/sun/net/httpserver/HttpHandlers.java
! src/jdk.httpserver/share/classes/com/sun/net/httpserver/HttpServer.java
! src/jdk.httpserver/share/classes/com/sun/net/httpserver/HttpsServer.java
! src/jdk.httpserver/share/classes/com/sun/net/httpserver/SimpleFileServer.java
! src/jdk.httpserver/share/classes/sun/net/httpserver/simpleserver/FileServerHandler.java
! src/jdk.httpserver/share/classes/sun/net/httpserver/simpleserver/Main.java
! src/jdk.httpserver/share/classes/sun/net/httpserver/simpleserver/SimpleFileServerImpl.java