tree bd49426db7ed927dd359dab8e9f0421dd139afd4
parent daac590fc1b5dffc202efdce1f03c007fe22fcfb
author Antoine Musso <hashar@free.fr> 1653121678 +0200
committer Antoine Musso <hashar@free.fr> 1662646132 +0200

doc: mention git submodule update

I at least once failed to build gitiles since I did not initialize git
submodule. Add a mention about it.

Change-Id: I1c60a9455cd5c2ab64599b8b3c6644881914bc67