[docs] small gdb internals cleanup

[Pedro Alves]

The Native Conditionals sections talks about several native preprocessor
defines.  CHILD_PREPARE_TO_STORE and FETCH_INFERIOR_REGISTERS are no
longer to be defined as macros.  gdbarch_fp0_regnum is now properly a target
arch property so the description should move to the Target Conditionals
section; gdbarch_get_longjmp_target is already described there as such.

Ok to apply?  I don't know where to draw the line on what obvious is
regarding the docs.

-- 
Pedro Alves
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