URL Cleanup (#164)

This commit updates URLs to prefer the https protocol. Redirects are not followed to avoid accidentally expanding intentionally shortened URLs (i.e. if using a URL shortener).

# Fixed URLs

## Fixed Success
These URLs were switched to an https URL with a 2xx status. While the status was successful, your review is still recommended.

* [ ] http://projects.spring.io/spring-cloud/ with 3 occurrences migrated to:
  https://projects.spring.io/spring-cloud/ ([https](https://projects.spring.io/spring-cloud/) result 200).
* [ ] http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd with 1 occurrences migrated to:
  https://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd ([https](https://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd) result 200).

# Ignored
These URLs were intentionally ignored.

* http://PROD-SVC with 6 occurrences
* http://docbook.org/ns/docbook with 3 occurrences
* http://www.w3.org/1999/xlink with 3 occurrences
* http://www.w3.org/2000/svg with 1 occurrences

spring-cloud-openfeign.xml

@@ -18,7 +18,7 @@ and binding to the Spring Environment and other Spring programming model idioms.
 <section xml:id="netflix-feign-starter">
 <title>How to Include Feign</title>
 <simpara>To include Feign in your project use the starter with group <literal>org.springframework.cloud</literal>
-and artifact id <literal>spring-cloud-starter-openfeign</literal>. See the <link xl:href="http://projects.spring.io/spring-cloud/">Spring Cloud Project page</link>
+and artifact id <literal>spring-cloud-starter-openfeign</literal>. See the <link xl:href="https://projects.spring.io/spring-cloud/">Spring Cloud Project page</link>
 for details on setting up your build system with the current Spring Cloud Release Train.</simpara>
 <simpara>Example spring boot app</simpara>
 <programlisting language="java" linenumbering="unnumbered">@SpringBootApplication