Retrieves the value of a snapshot and converts it to an instance of
caller-specified type.
Throws DecodingError.valueNotFound
if the document does not exist and T is not an Optional.
See Database.Decoder for more details about the decoding process.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2022-05-11 UTC."],[],[]]