Corrected file naming and broken links for Leadership Toolkit page

Why is this change being made?

• Corrected file naming and broken links for Leadership Toolkit page
• This merge request builds upon a few fixes here: !46218 (merged)

How will this merge request impact page speed?

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