C++ API, lack of a space between return type and function name

[rynnwu]

Problem

Formatting C++ API, it should have a space between return type and function name. Like:

float Sphinx::version
     ^
     |-- A space here

And it was ok in v0.5.1

Reproducible Project

Occurred in the latest version.

Environment Info

• Python Version: n/a
• Sphinx Version: n/a
• RTD Theme Version: latest

[StrikerRUS]

I can confirm this also happens in our docs.
https://lightgbm.readthedocs.io/en/latest/C-API.html#c.LGBM_BoosterCalcNumPredict

In addition, I'm not sure whether it is the same issue or another bug, but with sphinx_rtd_theme + Breathe there is no space between argument type and its name in C API. But I remember it happened for rtd version < 0.5.0 as well.

[stsewd]

Thanks for reporting, this is a duplicate of #694