message: More FP literals examples for documentation
diff: @@ -1640,9 +1640,15 @@ For example:
  ::
  - float two = 0x1p+1f; // 2.0
  - float pi = 0x1.921fb54442d18p+1f; // 3.1415926535...
  - float neg = -0x1.ffep+11f; // -4095.
  + float16 two_f16 = 2.0f16; // 2.0
  + float16 pi_f16 = 0x1.92p+1f16; // 3.1406
  + float16 neg_f16 = -65520.f16; // -Inf
  + float two_f = 0x1p+1; // 2.0
  + float pi_f = 0x1.921fb6p+1; // 3.14159274
  + float neg_f = -0x1.ffep+11; // -4095.0
  + double two_d = 2.0d; // 2.0
  + double pi_d = 0x1.921fb54442d18p+1; // 3.1415926535897931
  + double neg_d = -0.3333333333333333d; // -1/3
  Also, "Fortran double" format is accepted - a scientific notation with a literal
  