docs - change load.md to reflect current practice

[bpd0018]

The documentation in head should reflect current best practice while still providing the historical background needed by developers who are maintaining older code. I think this documentation change covers the significant points

1. you no longer need to explicitly load the driver
2. the driver jar file must be on the classpath in order for the driver to load
3. the old way still works but isn't needed

[codecov-io]

Codecov Report

Merging #1058 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             master   #1058      +/-   ##
===========================================
- Coverage      67.1%   67.1%   -0.01%     
+ Complexity     3653    3652       -1     
===========================================
  Files           170     170              
  Lines         15618   15618              
  Branches       2525    2525              
===========================================
- Hits          10481   10480       -1     
  Misses         3947    3947              
- Partials       1190    1191       +1