calcs/hazard/classical:

Added detailed UHS doc.
calcs/hazard/classical:

Corrected an instance of "mean" to "quantile". It was a copy/paste error.
calcs/hazard/classical:

Corrected some typos.
calcs/hazard/classical:

Fixed a typo.
calcs/hazard/event_based:

Added section hyperlinks for ses, gmf, and hazard curves.
calcs/hazard/event_based:

Corrected a typo.
calcs/hazard/event_based:

Added a note about mean and quantile hazard curves.
calcs/hazard/event_based:

Added the hazard maps section to EB doc.
docs/source/calcs/hazard.rst:

Moved docs for Disagg. to the disaggregation package __init__.
calcs/hazard/disaggregation:

Added detailed disagg doc.
calcs/hazard:

Updated calculator doc for clarity (per review comments).
Merge pull request #1159 from larsbutler/improved-hazard-doc

Improved hazard calculator documentation

[r=matley,monellid] [f=*trivial]