Update docs around advanced orders and OCO/trigger

[alexgolec]

Apparently composite orders no longer require Advanced Features to be disabled

[codecov]

Codecov Report

Merging #302 (8c2d4cb) into master (1922c54) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #302   +/-   ##
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  Coverage   99.58%   99.58%           
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  Files          19       19           
  Lines        2193     2193           
  Branches      306      306           
=======================================
  Hits         2184     2184           
  Misses          4        4           
  Partials        5        5           

Flag	Coverage Δ
unittests	99.58% <ø> (ø)

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[s-maheshbabu]

There is this statement here.

This will also preclude you from placing complex orders, like 1 TRG OCO.

Should we remove that statement or make it less assertive?

[alexgolec]

I'm confused, that's a link to a different project

[s-maheshbabu]

Oops, I mixed up things. I'm working with the other repo too and confused things :)
Sorry about that. Your current PR lgtm.