ARROW-8448: [Packaging] Update linux-packages README
ARROW-8448: [Packaging] Update linux-packages README

Closes #6968 from fsaintjacques/ARROW-8448

Authored-by: François Saint-Jacques <76801b7d5fe2c448a8401d2246372be49d372480@gmail.com>
Signed-off-by: Sutou Kouhei <73218711cdd5d5c30ac66da3cc4d9d9204caf34b@clear-code.com>

kou/arrow,icexelloss/arrow,xhochy/arrow,cpcloud/arrow,laurentgo/arrow,xhochy/arrow,wesm/arrow,laurentgo/arrow,wesm/arrow,laurentgo/arrow,wesm/arrow,wesm/arrow,wesm/arrow,cpcloud/arrow,apache/arrow,icexelloss/arrow,xhochy/arrow,cpcloud/arrow,apache/arrow,cpcloud/arrow,icexelloss/arrow,apache/arrow,cpcloud/arrow,wesm/arrow,cpcloud/arrow,apache/arrow,laurentgo/arrow,icexelloss/arrow,apache/arrow,wesm/arrow,kou/arrow,icexelloss/arrow,xhochy/arrow,apache/arrow,laurentgo/arrow,kou/arrow,laurentgo/arrow,kou/arrow,xhochy/arrow,apache/arrow,xhochy/arrow,apache/arrow,icexelloss/arrow,cpcloud/arrow,laurentgo/arrow,xhochy/arrow,laurentgo/arrow,xhochy/arrow,apache/arrow,cpcloud/arrow,kou/arrow,xhochy/arrow,kou/arrow,kou/arrow,icexelloss/arrow,icexelloss/arrow,laurentgo/arrow,wesm/arrow,kou/arrow,kou/arrow,xhochy/arrow,icexelloss/arrow,apache/arrow,apache/arrow,cpcloud/arrow,cpcloud/arrow,apache/arrow,wesm/arrow,laurentgo/arrow,cpcloud/arrow,icexelloss/arrow,laurentgo/arrow,icexelloss/arrow,wesm/arrow,xhochy/arrow,wesm/arrow,xhochy/arrow,icexelloss/arrow,apache/arrow,apache/arrow,cpcloud/arrow,kou/arrow,cpcloud/arrow,laurentgo/arrow,icexelloss/arrow,xhochy/arrow,xhochy/arrow,laurentgo/arrow,wesm/arrow,kou/arrow,laurentgo/arrow,icexelloss/arrow,xhochy/arrow,kou/arrow,wesm/arrow,laurentgo/arrow,kou/arrow,cpcloud/arrow,wesm/arrow,kou/arrow