intrinsic.texi (LBOUND): Add documentation.

* intrinsic.texi (LBOUND): Add documentation.
(LGE): Add documentation.
(LGT): Add documentation.
(LINK): Add documentation.
(LLE): Add documentation.
(LLT): Add documentation.
(LNBLNK): Add documentation.
(UBOUND): Add documentation.
(UNLINK): Add documentation.

From-SVN: r120466