Update HltEfficiencyChecker docs for running chained HLT1 and HLT2
FYI @mkenzie @rmatev @sstahl @mvesteri
Adds docs to describe what is happening in MooreAnalysis!58 (merged).
TODO:
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Add results from HLT1-and-HLT2 rate example. -
Check it builds nicely.
Required by MooreAnalysis!58 (merged).
Edited by Ross John Hunter