Updated Technical Writer responsibilities per new career descriptions

Why is this change being made?

An FY21 Q1 OKR for UX is to provide clear career paths for all roles. This MR updates the responsibilities for all individual contributor roles on the technical writing team.

Does this MR meet the acceptance criteria?

Assign to DRI

• Did you assign this change to the correct DRI of the page or information you are changing?

Conformity

• Added description to this MR explaining the reasons for the proposed change, per say-why-not-just-what