Equation editor suggestion for doc addition

I have a suggestion for a small addition to the examples that appear in the documentation for the Math equation editor.  If there is a better place to report or suggest this. Please let me know.

When creating an equation for Writer using the Math tool, it was required to add a "-" (minus sign) as a free standing exponent. Not as a negative value, just a lone minus sign.  An example can be created using the following limit equation as an example:

lim from{x %tendto 6 sup -{} } { frac 2 (x-6)sup 3 }

Note the "6 sup -{}". The empty {} is required or the equation editor will expect a value, like -x or -5 or some unary operator. The {} appeases the robot and allows the free standing "-" to appear.  (The meaning is the limit as x approaches 6 from the negative side.)

An hour long search and trial and error session by two people was required before we stumbled on this solution.  It might save the next person at least that long to figure this out.

BTW, If there is a location that would have lead us to this more easily it would be helpful if someone can point it out. Always willing to learn from others experience and knowledge.

Thank you.