Link directly to O'Really PDFs (#3060)

* Link directly to O'Really PDFs

O'Reilly has been changing up some of these links, redirecting you to a rather scarce hub.
But they are still hosting the files.

This change is justified by the file still being publicly hosted.

* Fix annotation for linter

* I guess the linter wants PDF capitalized

free-programming-books.md

@@ -716,9 +716,9 @@ Kerridge (PDF) (email address *requested*, not required)
 * [Kanban and Scrum - making the most of both](http://www.infoq.com/minibooks/kanban-scrum-minibook)
 * [Kanban for skeptics](https://leanpub.com/kanbanforskeptics) - Nick Oostvogels  *(Leanpub account or valid email requested)*
 * [Microservice Databases: Migrating from Relational Monolith to Distributed Data](http://www.oreilly.com/programming/free/migrating-to-microservice-databases.csp) (email address *requested*, not required)
-* [Microservices AntiPatterns and Pitfalls](http://www.oreilly.com/programming/free/microservices-antipatterns-and-pitfalls.csp) (email address *requested*, not required)
+* [Microservices AntiPatterns and Pitfalls](https://www.oreilly.com/programming/free/files/microservices-antipatterns-and-pitfalls.pdf) (PDF)
 * [Microservices in Production](http://www.oreilly.com/programming/free/microservices-in-production.csp) (email address *requested*, not required)
-* [Microservices vs. Service-Oriented Architecture](http://www.oreilly.com/programming/free/microservices-vs-service-oriented-architecture.csp) (email address *requested*, not required)
+* [Microservices vs. Service-Oriented Architecture](https://www.oreilly.com/programming/free/files/microservices-vs-service-oriented-architecture.pdf) (PDF)
 * [Migrating to Cloud-Native Application Architectures](http://www.oreilly.com/programming/free/migrating-cloud-native-application-architectures.csp) (email address *requested*, not required)
 * [Naked objects](http://downloads.nakedobjects.net/resources/Pawson%20thesis.pdf) - Richard Pawson (PDF)
 * [OAuth - The Big Picture](https://pages.apigee.com/oauth-big-picture-ebook.html)