Combo Order in Option Strategies

[LouisSzeto]

Description

Add section in Option Strategies on using combo order instead of helper method to submit orders for option strategies Note: Protective Collar is not change, due to its refactor will be in other PR for its new abstraction method

Related Issue

close #1356

Motivation and Context

missing

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [X] Refactor (non-breaking change which improves implementation)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Non-functional change (xml comments/documentation/etc)

Checklist:

• [X] My code follows the code style of this project.
• [X] I have read the CONTRIBUTING document.
• [X] My branch follows the naming convention bug-<issue#>-<description> or feature-<issue#>-<description>