HPCC-9654 Add helpful text about treemaps

Add text describing how the treemaps are used in the timings page.

Signed-off by: Miguel Vazquez <miguel.vazquez@lexisnexis.com>

HPCC-9654 Add helpful text about treemaps

Add text describing how the treemaps are used in the timings page.

Signed-off by: Miguel Vazquez <miguel.vazquez@lexisnexis.com>