Add tooltips to summary table headings

[AlexTheLion123]

Goal

As a strategy developer, I want to see tooltips to summary table row headings so that I can easily find more information about a statistic.

Acceptance criteria

• [ ] Any statistic that may need further explanation has a tooltip
• [ ] This applies to the long only table and the long-short table
• [ ] Tooltip for value at end statistic (does it include realised/unrealised profits)

[miohtama]

Make sure it works on the documentation site as well.

Post link to a documentation where it is being used.

[AlexTheLion123]

TODO:

• [ ] add to docs

[AlexTheLion123]

First want #640 to be fixed, so that summary table shows correct realized profit amounts

[AlexTheLion123]

This should be fixed now, can go ahead