Adds logging for the sectionNumbers field in the PageIssues schema.
Additional changes:
* createBanner now requires section number to be a string - this ensures
consistency with how these are used.
* fix a bug which meant createBanner was being called with undefined
section number (due to table of contents)
* Fix some indents in some JSDoc blocks
* Change parameter in function signature from mixed type (int or string)
to explicit string
* update schema number
Depends-On: Ia2696b86c6855d7b46a3f668585377d106d7af23
Bug: T202098
Change-Id: I20511a77258ea245f3d6fe93ade238e5df397a71
ae19031f8e