Improve ActiveSupport::ErrorReporter API doc [ci-skip]
Improve ActiveSupport::ErrorReporter API doc [ci-skip]

This moves some of the documentation from the `ErrorReporter` class
directly to the `handle` and `record` methods, and fleshes those out.
This also tweaks the documentation of the other `ErrorReporter` methods.

esparta/rails,BlakeWilliams/rails,rails/rails,BlakeWilliams/rails,georgeclaghorn/rails,yahonda/rails,yahonda/rails,MSP-Greg/rails,MSP-Greg/rails,MSP-Greg/rails,esparta/rails,rails/rails,MSP-Greg/rails,BlakeWilliams/rails,georgeclaghorn/rails,yahonda/rails,yahonda/rails,georgeclaghorn/rails,georgeclaghorn/rails,esparta/rails,rails/rails,esparta/rails,BlakeWilliams/rails,rails/rails