model description clarifications

[sbfnk]

Some small corrections and a few suggested clarifications to the model description.

[seabbs]

Thanks, will review it today. Just noting the last 2 bullets in the contributing guide (https://epiforecasts.io/epinowcast/CONTRIBUTING.html) and ideally these changes should be targeted at the develop branch (which is not in the contributing guide but will be soon)

[sbfnk]

updated to address #78 and for consistent notation with regard to times and dates (related to #81).

[codecov]

Codecov Report

Merging #71 (d47dcbf) into develop (ba6f217) will not change coverage.
The diff coverage is n/a.

❗ Current head d47dcbf differs from pull request most recent head 005b74f. Consider uploading reports for the commit 005b74f to get more accurate results

@@           Coverage Diff            @@
##           develop      #71   +/-   ##
========================================
  Coverage    62.57%   62.57%           
========================================
  Files           12       12           
  Lines          946      946           
========================================
  Hits           592      592           
  Misses         354      354           

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