doc updates for section "Particular Functions"

Hi, Paul's commit yesterday reminded me that Autoconf contains some macros that have more complete and up-to-date counterparts in Gnulib. Here are three proposed patches, all to the documentation section "Particular Functions".

Re: doc updates for section "Particular Functions"

Oops, I withdraw 0003. (I had misunderstood what AC_FUNC_MMAP does.) Please use this one instead. >From f3f0bc607012a8f30a674000b570ef85433ecc74 Mon Sep 17 00:00:00 2001 From: Bruno Haible Date: Fri, 31 Jul 2020 13:26:04 +0200 Subject: [PATCH 3/3] doc: Update some more macro descriptions. * doc

Re: doc updates for section "Particular Functions"

On 7/31/20 5:01 AM, Bruno Haible wrote: Oops, I withdraw 0003. (I had misunderstood what AC_FUNC_MMAP does.) Please use this one instead. Thanks, I installed those three patches, followed by the attached minor patch to Gnulib-related wording. >From e9bfc7c7582a6b69bf753f2bea5d4cb1f669759a Mon