Merge pull request #215 from michalmarcinkowski/master

[WCM] Initial docs for ContactBundle and Contact component
Fix wrong inventory operator service
Correct XML tags and fix formatting on XML codeblock
Merge pull request #216 from alexptrn/sylius_inventory_doc

Fix wrong inventory operator service
Merge pull request #217 from adamelso/patch-2

Correct XML tags and fix formatting on XML codeblock
Initial Newsletter bundle and component docs