Changing the y-label from 'Number of samples' to 'Number of variants'

[michael-harper]

The graph titled 'Per genetic ancestry group count of non-synonymous coding variants in canonical transcripts with a overall gnomAD (within version) AF >0.1' has it's y-label as 'Number of samples' when it should be 'Number of variants'

gnomad-browser/browser/src/StatsPage/StatsPage.tsx

Line 372 in ecaca57

yLabel="Number of samples"