fix path for secure code training control guidance

Why is this change being made?

Fixing an error in the path for the link to TRN.2.01 page.

How will this merge request impact page speed?

N/A

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