Multiple CSuite test programs have function level comments don't have a description of the function and instead have a TODO indicating that a description need to b provided.

For example:

/*
 * remove_records --
 *     TODO: Add a comment describing this function.
 */

A partial list of the tests that exhibit this problem includes:

• wt4117_checksum
• wt4156_metadata_salvage
• wt4333_handle_locks
• wt4803_history_store_abort
• wt6616_checkpoint_oldest_ts
• wt7989_compact_checkpoint
• wt8057_compact_stress
• wt8246_compact_rts_data_correctness

This ticket is to replace those TODOs with useful comments.