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Ian Alexander Joiner authored and Sutou Kouhei committed 8733248f3ae
ARROW-16237: [Docs] Apache Impala is no longer incubating According to https://incubator.apache.org/projects/ Apache Impala graduated in 2017. Hence all instances of "incubating" in our user guides related to Impala need to be removed. Closes #12923 from iajoiner/ARROW-16237 Authored-by: Ian Alexander Joiner <iajoiner809@gmail.com> Signed-off-by: Sutou Kouhei <kou@clear-code.com>