Raf Czlonka authored Dec 20, 2018 and Brad King committed Jan 10, 2019

Move `.so` to the line above - otherwise it is being treated as a `roff`
macro, i.e.:

    $ mandoc -Tlint /usr/local/man/man7/cmake-properties.7 | head -n 3
    mandoc: /usr/local/man/man7/cmake-properties.7:1131:2: WARNING: .so is fragile, better use ln(1): so libraries.
    mandoc: /usr/local/man/man7/cmake-properties.7: ERROR: No such file or directory
    mandoc: /usr/local/man/man7/cmake-properties.7:1131:15: ERROR: .so request failed: .so libraries.

and causes other issues down the line.