Help: Fix --build-and-test synopsis in ctest(1)

The synopsis added by commit 9d3aa95c (Help: Divide ctest(1) manual
options into sections, 2017-11-08, v3.11.0-rc1~359^2~2) is missing the
actual `--build-and-test` argument!  Add it now.
Status Job ID Name Coverage
  External
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