children: fix the log expansion of `hg children` in doc
`hg log -r children()` returns `hg: parse error: missing argument`. Differential Revision: https://phab.mercurial-scm.org/D1269
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`hg log -r children()` returns `hg: parse error: missing argument`. Differential Revision: https://phab.mercurial-scm.org/D1269