[STORY-API 566] Updated Balances, Positions, Position Groups related documentation for SCSK
[STORY-API 566] Place Order related documentation for SCSK
[STORY-API 566] Changes for SCSK documentation
[STORY-API 566] Updates for SCSK documentation
Merge branch 'v2' of http://gitlab.trad.tradestation.com/tradestation/webapi-docs into v2

Conflicts:
	en/accounts/orders.md
	en/accounts/position-groups.md
	en/accounts/positions.md
	en/orders/place-order.md
Merge branch 'v2' into 'v2'

V2

[STORY-API 566] Updates for SCSK documentation

See merge request !29