Update browser-window.md with alpha hex formatting (#16269)
Update browser-window.md with alpha hex formatting (#16269)

HEX with alpha can be #RRGGBBAA or #AARRGGBB. In Electron it's the latter. It's nice to explicitly state that, so others wont have to try twice like me :).
gerhardberger/electron,electron/electron,seanchas116/electron,electron/electron,the-ress/electron,gerhardberger/electron,bpasero/electron,electron/electron,the-ress/electron,the-ress/electron,electron/electron,bpasero/electron,bpasero/electron,gerhardberger/electron,seanchas116/electron,electron/electron,the-ress/electron,electron/electron,gerhardberger/electron,bpasero/electron,gerhardberger/electron,seanchas116/electron,electron/electron,seanchas116/electron,bpasero/electron,gerhardberger/electron,bpasero/electron,seanchas116/electron,the-ress/electron,seanchas116/electron,the-ress/electron,bpasero/electron,the-ress/electron,gerhardberger/electron