Fixed embedded references
Merge branch 'fix_roles' of github.com:WouterJ/symfony-docs into WouterJ-fix_roles

Conflicts:
	book/http_fundamentals.rst
	cookbook/bundles/extension.rst
[#2996] Tweaks to adding spaces for RST formatting throughout the docs

... there were just some extra spaces, some links were on multiple lines (always), which should be corrected, and some tables got misformatted