ARROW-10543: [Developer] Add a note about being patient after gitbox is enabled
ARROW-10543: [Developer] Add a note about being patient after gitbox is enabled

When following the developer instructions, I was hung up for a while on the fact that there seemed to be a time lag between when I completed the gitbox setup and when permissions were actually granted to the repo. Update the docs to try and help the next person.

FYI @wesm and @jorgecarleitao  (I wonder if Jorge hit the same issue when he reported the same symptoms I was seeing here https://lists.apache.org/thread.html/r2420f6d13601913100ed49bc955bb7925fc4a91b5601995190467bbb%40%3Cdev.arrow.apache.org%3E)

Closes #8622 from alamb/alamb/ARROW-10543-docs

Lead-authored-by: alamb <02e0a999c50b1f88df7a8f5a04e1b76b35ea6a88@nerdnetworks.org>
Co-authored-by: Andrew Lamb <02e0a999c50b1f88df7a8f5a04e1b76b35ea6a88@nerdnetworks.org>
Signed-off-by: Sutou Kouhei <73218711cdd5d5c30ac66da3cc4d9d9204caf34b@clear-code.com>

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