[PATCH 2 of 2] print help for undocumented options

[Martin Sebor]

Following up on PATCH 1 of 2 (below), attached is patch 2 for PR
driver/68043 with mostly generated changes to .opt files to end
each final sentence describing an option with a period.

   https://gcc.gnu.org/ml/gcc-patches/2015-10/msg02171.html

Martin

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