The phrase "update section" refers to making changes or adding new information to a specific part of something, such as a document, website, or other piece of content. Full definition
I have also updated the section of the book on TD for the new interface (click here). (valueofsimple.ca)
That said, you need to bear in mind the official release date for the update won't always be reflected in the software update section on your phone. (techradar.com)
For this reason, we'll keep updating this section as often as possible with stock info, price changes, and new mats. (macrumors.com)