Remove subplots.ylabspace, etc. from configuration docs

Author: lukelbd

docs/configuration.rst

@@ -170,11 +170,6 @@ Key(s)                           Description
 ``subplots.pad``                 Padding around figure edge. Units are interpreted by `~proplot.utils.units`.
 ``subplots.axpad``               Padding between adjacent subplots. Units are interpreted by `~proplot.utils.units`.
 ``subplots.panelpad``            Padding between subplots and panels, and between stacked panels. Units are interpreted by `~proplot.utils.units`.
-``subplots.titlespace``          Vertical space for titles. Units are interpreted by `~proplot.utils.units`.
-``subplots.ylabspace``           Horizontal space between subplots allotted for *y*-labels. Units are interpreted by `~proplot.utils.units`.
-``subplots.xlabspace``           Vertical space between subplots allotted for *x*-labels. Units are interpreted by `~proplot.utils.units`.
-``subplots.innerspace``          Space between subplots allotted for tick marks. Units are interpreted by `~proplot.utils.units`.
-``subplots.panelspace``          Purely empty space between main axes and side panels. Units are interpreted by `~proplot.utils.units`.
 ``suptitle.color``               Figure title color.
 ``suptitle.size``                Figure title font size.
 ``suptitle.weight``              Figure title font weight.