Update versionadded to 5.2.0 from ... 2.1 for LaTeX with booktabs

The actual interface is still to be discussed, perhaps

latex_tables_use_booktabs

is more in line with other existing options such as

latex_use_xindy
latex_use_latex_multicolumn

doc/usage/configuration.rst

@@ -2247,7 +2247,7 @@ These options influence LaTeX output.
    varying thickness (with additional space above and below) using the
    ``booktabs`` package.
 
-   .. versionadded:: 2.1
+   .. versionadded:: 5.2.0
 
 .. confval:: latex_elements