Document show output history

[gerhardol]

Based on #150, feature is not merged yet (so first commit is not to be reviewed).

Build available: https://git-extensions-documentation.readthedocs.io/en/tmp-4.3/settings.html#tabs-show-output-history-as-tab-otherwise-as-panel

Documents https://github.com/gitextensions/gitextensions/pull/10307

Written by @mstv, I basically just added the new settings

Revision grid configuration added in master have no description for now.

[gerhardol]

This pr contains the changes for https://github.com/gitextensions/gitextensions/pull/10307 and will be merged after #150