Don't put "-* no-capture-flag *-" on its own line

[d-torrance]

Otherwise, the documentation will be garbled.

When not-capturing an example, we remove any instances of the string "-* no-capture-flag *-". If this string is by itself on a line, then we end up with an empty line in the example input, which messes everything up.

One example is the findProgram docs. This is out of order:

     +----------------------------------------------------------------------------+
     |  i3 : findProgram "normaliz"                                               |
     |                                                                            |
     |  o3 = normaliz                                                             |
     |                                                                            |
     |  o3 : Program                                                              |
     +----------------------------------------------------------------------------+

     If cmd is not provided, then cmd is run with the common --version command
     line option.

After the change:

     If cmd is not provided, then name is run with the common --version command
     line option.

     +-------------------------------+
     |  i3 : findProgram "normaliz"  |
     |                               |
     |  o3 = normaliz                |
     |                               |
     |  o3 : Program                 |
     +-------------------------------+

It might be more elegant to also remove the newline in the special case where -* no-capture-flag *- is by itself on a line. Allowing -- no-capture-flag would be cool too. But that would require some fancier regexes. But right now, this only affects Macaulay2Doc. Maybe something to think about if/when we start capturing the other packages' examples.