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doc: formalize `auto` usage in C++ style guide

Rodrigo Muino Tomonari requested to merge github/fork/addaleax/cpp-style-update into master

Adjust heading levels to align with the table of contents, and write down 2 more existing rules (avoiding non-const references and auto under most circumstances).

We generally avoid using auto if not necessary. This formalizes this rules by writing them down in the C++ style guide.

The other part of the PR has been split out into #23155.

Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • documentation is changed or added
  • commit message follows commit guidelines

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