Update index.html

Updated table of contents link and link description from `update_user()` to `update()` to properly reflect actual class name.
Removed free_result call on num_rows()

free_result() should not be called with running num_rows() since you will want to return the query after that if there are records.

Resolves issue #593
Updated database loading in the controller (via Debjit Saha <debjitsaha87@gmail.com>)
Merge pull request #650 from sparky672/patch-2

Update index.html