In the SYNOPSIS, .Nm at the beginning of an input line starts

In the SYNOPSIS, .Nm at the beginning of an input line starts
an .Nm block, and gets special handling (new line, indentation).
But .Nm in the middle of a line is just a normal in-line element,
so make sure it does NOT get the special handling.
Partly fixes the test(1) SYNOPSIS; indentation after "[" is still
excessive, which is an unrelated and more difficult issue.
Reminded of the problem by jmc@;
OK kristaps@.