Merge pull request #750 from boostorg/issue749

Correct docs to fix #749

Author: ckormanyos

doc/tutorial_floats.qbk

@@ -16,10 +16,10 @@ The following back-ends provide floating-point arithmetic:
 [[Backend Type][Header][Radix][Dependencies][Pros][Cons]]
 [[`cpp_bin_float<N>`][boost/multiprecision/cpp_bin_float.hpp][2][None][Header only, all C++ implementation. Boost licence.][Approximately 2x slower than the [mpfr] or [gmp] libraries.]]
 [[`cpp_dec_float<N>`][boost/multiprecision/cpp_dec_float.hpp][10][None][Header only, all C++ implementation. Boost licence.][Approximately 2x slower than the [mpfr] or [gmp] libraries.]]
-[[`mpf_float<N>`][boost/multiprecision/gmp.hpp][2][[gmp]][Very fast and efficient back-end.][Dependency on GNU licensed [gmp] library.]]
-[[`mpfr_float<N>`][boost/multiprecision/mpfr.hpp][2][[gmp] and [mpfr]][Very fast and efficient back-end, with its own standard library implementation.][Dependency on GNU licensed [gmp] and [mpfr] libraries.]]
-[[`float128`][boost/multiprecision/float128.hpp][2][Either [quadmath] or the Intel C++ Math library.][Very fast and efficient back-end for 128-bit floating-point values (113-bit mantissa, equivalent to FORTRAN's QUAD real)][Depends on the compiler being either recent GCC or Intel C++ versions.]]
-[[`cpp_double_fp_backend<T>`][boost/multiprecision/cpp_double_fp_backend.hpp][2][None][Header only, all C++ implementation. Boost licence.][Approximately 2x double-`float`, `double`, `long double` or `boost::float128_type` designed for lower-precision, higher run-time performance.]]
+[[`gmp_float<N>`][boost/multiprecision/gmp.hpp][2][[gmp]][Very fast and efficient back-end.][Dependency on GNU licensed [gmp] library.]]
+[[`mpfr_float_backend<N>`][boost/multiprecision/mpfr.hpp][2][[gmp] and [mpfr]][Very fast and efficient back-end, with its own standard library implementation.][Dependency on GNU licensed [gmp] and [mpfr] libraries.]]
+[[`float128_backend`][boost/multiprecision/float128.hpp][2][Either [quadmath] or the Intel C++ Math library.][Very fast and efficient back-end for 128-bit floating-point values (113-bit mantissa, equivalent to FORTRAN's QUAD real)][Depends on the compiler being either recent GCC or Intel C++ versions.]]
+[[`cpp_double_fp_backend<T>`][boost/multiprecision/cpp_double_fp.hpp][2][None][Header only, all C++ implementation. Boost licence.][Approximately 2x double-`float`, `double`, `long double` or `boost::float128_type` designed for lower-precision, higher run-time performance.]]
 ]
 
 [include tutorial_cpp_bin_float.qbk]