Update some broken links

Begins to work ceph#212

Author: Thingee

Diff for: src/en/community/events/2019/ceph-day-poland/index.md

@@ -17,7 +17,7 @@ sponsors:
         website: "https://www.ovh.co.uk/"
       - name: RedHat
         logo: "/assets/bitmaps/logo-redhat.png"
-        website: "https://redhat.co"
+        website: "https://redhat.com"
       - name: SoftIron
         logo: "/assets/bitmaps/logo-softiron.png"
         website: "https://softiron.com"

Diff for: src/en/community/events/2019/cephalocon-barcelona/index.md

@@ -14,7 +14,7 @@ sponsors:
     list:
       - name: RedHat
         logo: "/assets/bitmaps/logo-redhat.png"
-        website: "https://redhat.co"
+        website: "https://redhat.com"
       - name: Intel Optane DC
         logo: "/assets/bitmaps/logo-intel-optane.png"
         website: "https://www.intel.com/content/www/us/en/architecture-and-technology/intel-optane-technology.html"

Diff for: src/en/news/publications/index.md

@@ -18,6 +18,11 @@ Following the original publication on Ceph, the PhD thesis by Sage Weil, a varie
   - Vikhyat Umrao, Michael Hackett, Karan Singh
   - November 2017
 
+* [Learning Ceph](https://www.packtpub.com/virtualization-and-cloud/learning-ceph)
+  - Anthony D'Atri , Vaibhav Bhembre , Karan Singh
+  - Packt Publishing
+  - October 2017
+
 * [Ceph 分布式存储实战](https://www.amazon.cn/Ceph-Ceph/dp/B01N4AER2C/ref=tmm_pap_swatch_0)
   - Ceph China Community
   - December 1, 2016
@@ -26,11 +31,6 @@ Following the original publication on Ceph, the PhD thesis by Sage Weil, a varie
   - Karan Singh
   - February 2016
 
-* [Learning Ceph](https://www.packtpub.com/virtualization-and-cloud/learning-ceph)
-  - Karan Singh
-  - Packt Publishing
-  - January 2015
-
 ---
 
 ### Papers
@@ -106,7 +106,7 @@ Following the original publication on Ceph, the PhD thesis by Sage Weil, a varie
   - Proceedings of the 13th International Symposium on Modeling, Analysis, and Simulation of Computer and Telecommunication Systems (MASCOTS ’05)
   - September 2005
 
-- [mpact of Failure on Interconnection Networks in Large Storage Systems](http://www.ssrc.ucsc.edu/Papers/xin-mss05.pdf)
+- [Impact of Failure on Interconnection Networks in Large Storage Systems](http://www.ssrc.ucsc.edu/Papers/xin-mss05.pdf)
   - Qin Xin, Ethan L. Miller, Thomas Schwarz, Darrell D. E. Long
   - Proceedings of the 22nd IEEE / 13th NASA Goddard Conference on Mass Storage Systems and Technologies
   - April 2005