Add information about expectations for insert+tab and insert+up commands to the test writing documentation

[mcking65]

Using feedback from Vispero, we can promote consistency in expectations across test plans for the commands for describing an element (insert+tab) and reading the current line or element (insert+up). It would be helpful to have reference documentation defining expectations for these commands.

In #1094, @RFischer-FS wrote:

We would like to adjust the requirements for Insert+Up Arrow(Say Line). Insert+ Up Arrow and Insert+tab are both used to request information. However, Say Line should provide basic information, while Insert+Tab should provide more comprehensive information, like the description and context.

Please remove the following requirements from the Insert+Up Arrow test:

• Position of the radio button
• Number of radio buttons in the group
• Role 'group'
• Name of the group

Differnciation between Insert+Up Arrow(Say Line) and Insert+Tab:

Insert+Up Arrow It should provide basic element information, excluding the environment and description. Similar to: Name, State, Value, Role

Insert+Tab Should provide more comprehensive information Similar to Name, State, Value, Role, Position, Number of items, description, and Group Name