[PATCH v2] Changes to gcc-16/porting_to

[Nathan Myers]

gcc-wwwdocs/Changelog:

	* htdocs/gcc-16/porting_to.html: Numerous edits.

---
     Changes in v2:

      - Remove s/provide/suggest/ change from template boilerplate text.
      - Use "Common" only to indicate "both C and C++".
      - Remove introductory paragraphs about origin in package builds.
      - Call it "GCC 16" throughout, with NBSP where it might make
       a difference.
      - Reproduce compiler message texts using ASCII quote marks.
      - Move case of transient includes from Common to C++ section.
      - Remove quote marks from <code> annotations.
      - Remove case of function-object names not in C++20 but still
       supported in GCC 16.
      - Remove case about more "uninitialized variable" warnings.
      - Rewrite the case for spurious "-std=gnu++11" build option
       generated by pre-2.73 autoconf.
      - Add missing <code> tags.
      - Put "operator!=" case first in the C++ list.
      - Rewrite suggestion for fix for use of removed allocator members.

    Changes in v1:
       - Demote "C and C++" build errors to <h4>, matching C++
       - Promote 'uninitialized-variable', 'missing-header-includes'
        common build failures from C++ to "C and C++'.
       - Clarify comments on unused-but-set increment examples, and
        note that just silencing the warning is not necessarily the
        right action.
       - Add 'capture-this-deprecated' build failure in C++.
        (From package builds, it showed up only in jemalloc.)
       - Mention autoconf-2.73 change to AC_PROG_CXX under
        'wrong-standard', and suggest upgrading autoconf or removing
        AC_PROG_CXX.
       - Note that names removed from C++20 may still be seen in GCC-16
        headers when building with -std=c++20.
       - Note the -std=c++17 alternative to immediately renaming all
        'concept' and 'requires' identifiers.
       - Change 'error:' to 'warning:' in sample diagnostics for uses
        where the default is only a warning.
       - Indent example diagnostic messages.
       - Eliminate the 'specified bound 18446744073709551608' build
        failure example as too obscure. (It only showed up in jemalloc
        builds.)
       - Trivial wording improvements.

(patch attached, page as patched may be viewed at
<http://cantrip.org/porting_to.html>.)
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