[metric/bigtable] Fix typo and capitalization of Bigtable
[metric/bigtable] Fix typo and capitalization of Bigtable

lucilecoutouly/heroic,zfrank/heroic,spotify/heroic,dbrounst/heroic,spotify/heroic,spotify/heroic,OdenTech/heroic,lucilecoutouly/heroic,spotify/heroic,lucilecoutouly/heroic