Refreshed the reason gcc_check leaves RISC-V out (#722)

The header explained the exclusion by saying RISC-V "is not regressing" and
that adding it would widen the toolchain download. The second half is still
true; the first read as though nothing in CI exercised the family at all,
which stopped being the case with #717.

RISC-V is now the best-covered of the four excluded families rather than the
least: regression_test.yml builds both ports and runs 955 tests on them under
QEMU -- 475 on RV32 and 480 on RV64, across five build configurations each --
which is more than a compile-and-link check could establish. That is a
stronger argument for leaving it out of this workflow than the original, so
the sentence now makes it.

The download figure is kept and quantified: the two bare-metal toolchains this
workflow would have to fetch are about 500 MB apiece.

Comment only; no behaviour change. scripts/check_gcc.sh names the same four
families but states the exclusion without giving a reason for it, so it needs
no matching edit.

Assisted-by: Claude Code (Opus 5) <[email protected]>

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