Polish "Use HTTPS for external links wherever possible"

See gh-16317

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/transaction/jta/NarayanaJtaConfiguration.java

 /*
- * Copyright 2012-2016 the original author or authors.
+ * Copyright 2012-2019 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.
@@ -44,7 +44,7 @@ import org.springframework.transaction.jta.JtaTransactionManager;
 import org.springframework.util.StringUtils;
 
 /**
- * JTA Configuration for <a href="http://narayana.io/">Narayana</a>.
+ * JTA Configuration for <a href="https://github.com/jbosstm/narayana">Narayana</a>.
  *
  * @author Gytis Trikleris
  * @since 1.4.0

spring-boot-docs/src/main/asciidoc/spring-boot-features.adoc

@@ -5027,8 +5027,8 @@ the following provided libraries:
 * {spring-reference}/#integration-testing[Spring Test] & Spring Boot Test --
   Utilities and integration test support for Spring Boot applications.
 * https://joel-costigliola.github.io/assertj/[AssertJ] -- A fluent assertion library.
-* http://hamcrest.org/JavaHamcrest/[Hamcrest] -- A library of matcher objects (also known
-  as constraints or predicates).
+* https://github.com/hamcrest/JavaHamcrest[Hamcrest] -- A library of matcher objects
+  (also known as constraints or predicates).
 * https://mockito.github.io[Mockito] -- A Java mocking framework.
 * https://github.com/skyscreamer/JSONassert[JSONassert] -- An assertion library for JSON.
 * https://github.com/jayway/JsonPath[JsonPath] -- XPath for JSON.

spring-boot-starters/README.adoc

@@ -88,19 +88,19 @@ do as they were designed before this was clarified.
 | https://camunda.org/[Camunda BPM]
 | https://github.com/camunda/camunda-bpm-spring-boot-starter
 
-| http://ff4j.org/[Feature Flipping For Java (FF4J)]
+| https://ff4j.github.io[Feature Flipping For Java (FF4J)]
 | https://github.com/clun/ff4j/
 
 | https://resteasy.jboss.org/[RESTEasy]
 | https://github.com/paypal/resteasy-spring-boot
 
-| JSF (https://primefaces.org/[PrimeFaces], https://primefaces-extensions.github.io/[PrimeFaces Extensions], https://bootsfaces.net/[BootsFaces], http://butterfaces.org/[ButterFaces], https://omnifaces.org/[OmniFaces], https://angularfaces.net/[AngularFaces], https://javaserverfaces.java.net/[Mojarra] and https://myfaces.apache.org[MyFaces])
-| http://joinfaces.org
+| JSF (https://primefaces.org/[PrimeFaces], https://primefaces-extensions.github.io/[PrimeFaces Extensions], https://bootsfaces.net/[BootsFaces], https://github.com/ButterFaces/ButterFaces[ButterFaces], https://omnifaces.org/[OmniFaces], https://angularfaces.net/[AngularFaces], https://javaserverfaces.java.net/[Mojarra] and https://myfaces.apache.org[MyFaces])
+| https://github.com/joinfaces/joinfaces
 
 | Charon reverse proxy
 | https://github.com/mkopylec/charon-spring-boot-starter
 
-| http://wiremock.org/[WireMock] and Spring REST Docs
+| https://github.com/tomakehurst/wiremock[WireMock] and Spring REST Docs
 | https://github.com/ePages-de/restdocs-wiremock
 
 | https://cxf.apache.org/docs/springboot.html[Apache CXF]

spring-boot-tools/spring-boot-loader/src/main/java/org/springframework/boot/loader/jar/CentralDirectoryFileHeader.java

 /*
- * Copyright 2012-2016 the original author or authors.
+ * Copyright 2012-2019 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.
@@ -27,7 +27,7 @@ import org.springframework.boot.loader.data.RandomAccessData;
  *
  * @author Phillip Webb
  * @author Andy Wilkinson
- * @see <a href="https://en.wikipedia.org/wiki/Zip_%2528file_format%2529">Zip File Format</a>
+ * @see <a href="https://en.wikipedia.org/wiki/Zip_%28file_format%29">Zip File Format</a>
  */
 
 final class CentralDirectoryFileHeader implements FileHeader {
@@ -123,8 +123,8 @@ final class CentralDirectoryFileHeader implements FileHeader {
 
 	/**
 	 * Decode MS-DOS Date Time details. See
-	 * <a href="http://mindprod.com/jgloss/zip.html">mindprod.com/jgloss/zip.html</a> for
-	 * more details of the format.
+	 * <a href="https://docs.microsoft.com/en-gb/windows/desktop/api/winbase/nf-winbase-dosdatetimetofiletime">
+	 * Microsoft's documentation</a> for more details of the format.
 	 * @param date the date part
 	 * @param time the time part
 	 * @return a {@link Calendar} containing the decoded date.