At the bottom of some pages you will see a footer like:
This page is user maintained, and is not endorsed by the LLG.
Whereas other pages will claim to be of Category: Official.
Those latter are vouched for by the LLG Secretary.
You should feel free to change Official pages, however please understand that there is always at least one person who gets mail on every page change. When we see an Official page get changed, we inspect the changes carefully, and we might reverse them without warning or discussion if we don't agree with them.