Add link to the MDN page to the wiki link as it has better instructions.
Bug 859354 - Add and alerting tone when a second call is waiting.
r=gtorodelvalle
Merge pull request #9151 from etiennesegonzac/bug-859354-call-waiting-alert

Bug 859354 - Add and alerting tone when a second call is waiting.
Merge pull request #8856 from jwoodcock/master

Bug 855369 Added link to MDN to supplement the wiki link r=julien
Bug 857951 - DuT doesn't show 'busy line' screen or play 'busy line' tone.
Bug 862716 - Avoiding lazy load of contacts order
Merge pull request #9249 from gtorodelvalle/dialer-bug-857951-busy-tone-from-etiennesegonzac-bug-859354-call-waiting-alert

Dialer bug 857951 busy tone from etiennesegonzac bug 859354 call waiting alert (r=etiennesegonzac)
Merge pull request #9235 from albertopq/contacts-remove-lazyload-order

Bug 862716 - Avoiding lazy load of contacts order r=arcturus
Merge pull request #9243 from pivanov/bug-802234

Bug 802234 - [settings] Sound buttons for Call and Message require styling updates | Followup Patch r=samjoch
Bug 808250 - In Display settings, the icons for brightness slider seem flipped to people (followup)