[Documentation] Docs describe sdct.conf instead of syndicate.yml

[zhukovin]

Describe the requested changes
The page https://github.com/epam/aws-syndicate/wiki/5.-Using-aliases uses outdated names sdct.conf and sdct_aliases.conf, although for newly generated projects, the new names syndicate.yml and syndicate_aliases.yml are generated by Syndicate. This creates confusion for newcomers.

Is your documentation changes request related to a problem? Please describe.
The problem is just an unclear documentation, not a blocker.

Additional context
Related change:

[0.9.0] - 2020-04-06

Added

• Syndicate now supports configurations in YAML: syndicate.yml and syndicate_aliases.yml; The old ones (sdct.conf, sdct_alises.conf) are still supported.