Fix typo in developement.md (#3315)
Fix typo in developement.md (#3315)


chuckharmston/testpilot,chuckharmston/testpilot,lmorchard/idea-town-server,lmorchard/testpilot,meandavejustice/testpilot,mozilla/idea-town,mozilla/idea-town-server,meandavejustice/testpilot,mozilla/idea-town-server,mozilla/idea-town,mozilla/idea-town,lmorchard/idea-town-server,mozilla/idea-town,lmorchard/idea-town-server,lmorchard/testpilot,flodolo/testpilot,meandavejustice/testpilot,lmorchard/testpilot,lmorchard/testpilot,lmorchard/idea-town,lmorchard/idea-town,flodolo/testpilot,mozilla/idea-town-server,lmorchard/idea-town,meandavejustice/testpilot,lmorchard/idea-town,flodolo/testpilot,fzzzy/testpilot,fzzzy/testpilot,mozilla/idea-town-server,chuckharmston/testpilot,lmorchard/idea-town-server,chuckharmston/testpilot,flodolo/testpilot,fzzzy/testpilot,fzzzy/testpilot