TwoPunctures_BBHSF defines new macro outside of the "% START CACTUS THORNGUIDE" block

[Roland Haas]

This breaks that <config>-ThornGuide target with

! Undefined control sequence.
l.40349     \bracket
                    { \frac{^{(4)}R}{16\pi} - \frac{1}{2} g^{\mu\nu}
? 
! Emergency stop.

new macros must be defined inside of the magic comments ideally just below the comment % Add all definitions used in this documentation here which the documentation template contains.