Add more info about blog scheduling

Why is this change being made?

Asks for lead time when scheduling blog posts to give the Editorial team more notice.

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