change typo allel on allele in overlay data column
Currently in genetic-variant data overlay there is column *allel_frequency*. Please change it's name on *allele_frequency*. Also, the notification on deprecated columns should be changed as *allele_frequency* is correct name. I will correct the same typo in minerva/doc. ![Screen_Shot_2019-11-12_at_10.27.17](/uploads/6e0e71291b9064c3725aa75ec34082cd/Screen_Shot_2019-11-12_at_10.27.17.png)
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