docs: Update confirmation.md to add missing migration steps (#736) #1555

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Macro.Env.define_alias/4 is undefined or private

Macro.Env.define_import/4 is undefined or private

Macro.Env.define_require/4 is undefined or private

Macro.Env.expand_alias/4 is undefined or private

Macro.Env.expand_import/5 is undefined or private

Macro.Env.expand_require/6 is undefined or private

Logger.warn/1 is deprecated. Use Logger.warning/2 instead

atom ::: must be written between quotes, as in :"::", to avoid ambiguity