Sitewide boolean search description is wrong/misleading

[zerocrates]

In GettingStarted/Searching the boolean mode is described as:

Boolean, in which you can add Boolean operators like AND and NOT

In reality, the boolean mode uses MySQL's syntax as described in their docs. The main options are to use + before terms to require them (effectively AND), and - before terms to require they not be present (NOT), though there are some other operators also.