libselinux: man: Fix typo in man page

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This patch looks good to me. acked.

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iEYEARECAAYFAlD+qCsACgkQrlYvE4MpobPImwCfdvNZSOnbZykGrbpaZerW8ODJ f3EAnjnGTOY7p+jNafEvg9g+1q9Sevk6
=fh69
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