Generate the record size table in the docs from code.
Remove Heap Memory Usage table from cache configuration docs.

This table was hard to use, and hard to keep up to date.
It provided very little value, so the effort to keep it up to date is not worth it.
Better to remove it than to have false information in the docs.
Merge pull request #1081 from thobe/2.0-generate-record-size-table

Update the tables in the Cache configuration docs