Some typos.

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Detab

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Import `errors` in `make-error`.

In [83204] some commands to `import errors` were removed before calls to
`make-error`, which causes it to fail, as it uses `errors`. Rather than
restoring `import errors` I removed it from the other calls, and added it to
the function itself, which is hopefully less error prone.

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Add some C++11 keywords to syntax highlighter.

Quickbook's highlight includes the alternative operator representations (`and`,
and_eq` etc.). They should possibly be added as well.

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Normalise space in section class.

Cleans up the output a tad bit when there's no role.

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