re PR fortran/28068 (Non-standard intrinsics should be documented)

re PR fortran/28068 (Non-standard intrinsics should be documented)

PR fortran/28068
* intrinsic.texi: General whitespace cleanup, remove
comment about missing intrinsics.
(menu): Add lines for new entries listed below.
(ACOSH): Mention specific function DACOSH, correct
description phrasing.
(ASINH): Mention specific function DASINH, correct
description phrasing.
(ATANH): Mention specific function DATANH, correct
description phrasing.
(COS): Add index entry for CCOS.
(CPU_TIME): Correct "REAL" to "REAL(*)".
(EXP): Add index entry for CEXP.
(INT): Correct argument name to "A".
(INT2): New entry.
(INT8): New entry.
(LONG): New entry.
(MAX): Add index entries for specific variants.
(MCLOCK): New entry.
(MCLOCK8): New entry.
(SECNDS): Adjust to a more standard form.
(SECOND): New entry.
(TIME): Add cross-reference to MCLOCK.
(TIME8): Add cross-reference to MCLOCK8.

From-SVN: r122902