ABS Documentation fix

The specific intrinsics ZABS and CDABS return REAL(8) not COMPLEX(8).

From-SVN: r274847

gcc/fortran/ChangeLog

+2019-08-23  Mark Eggleston  <mark.eggleston@codethink.com>
+
+	* intrinsics.text: Correct the return types for ZABS and CDABS.
+
 2019-08-22  Steven G. Kargl  <kargl@gcc.gnu.org>
 
 	* intrinsic.c (add_subroutines): ERRMSG is INTENT(INOUT) in

gcc/fortran/intrinsic.texi

@@ -470,8 +470,8 @@ end program test_abs
 @item @code{IIABS(A)} @tab @code{INTEGER(2) A} @tab @code{INTEGER(2)} @tab GNU extension
 @item @code{JIABS(A)} @tab @code{INTEGER(4) A} @tab @code{INTEGER(4)} @tab GNU extension
 @item @code{KIABS(A)} @tab @code{INTEGER(8) A} @tab @code{INTEGER(8)} @tab GNU extension
-@item @code{ZABS(A)}  @tab @code{COMPLEX(8) A} @tab @code{COMPLEX(8)} @tab GNU extension
-@item @code{CDABS(A)} @tab @code{COMPLEX(8) A} @tab @code{COMPLEX(8)} @tab GNU extension
+@item @code{ZABS(A)}  @tab @code{COMPLEX(8) A} @tab @code{REAL(8)} @tab GNU extension
+@item @code{CDABS(A)} @tab @code{COMPLEX(8) A} @tab @code{REAL(8)} @tab GNU extension
 @end multitable
 @end table