Add a changelog entry for #13363 [ci skip]
Add a changelog entry for #13326 [ci skip]
Fix few typos in the documentation [ci skip]
Enable memcached service on travis for running cache tests.
Merge pull request #13436 from robin850/patch-11

Add missing changelog entries and fix few typos
Merge pull request #13438 from vipulnsward/enable-memache-on-travis

Enable memcached service on travis for running cache tests.