Bug 1116364 - Accept the plural form of deliverable, mitigation in the en-US dictionary. r=ehsan

extensions/spellcheck/locales/en-US/hunspell/dictionary-sources/upstream-hunspell.diff

@@ -9677,6 +9677,10 @@
 > cysteine/M
 19536a25296
 > decertify/DSGNX
+19759c25519
+< deliverable/U
+---
+> deliverable/US
 19935a25696
 > dequeue/DSG
 19999a25761
@@ -10461,6 +10465,10 @@
 < mister's
 ---
 > mister/M
+33083c38784
+< mitigation/M
+---
+> mitigation/MS
 33107,33108c38808
 < mob's
 < mob/CS

extensions/spellcheck/locales/en-US/hunspell/en-US.dic

@@ -25788,7 +25788,7 @@ delirious/PY
 deliriousness/M
 delirium/SM
 deliver/ADGS
-deliverable/U
+deliverable/US
 deliverance/M
 delivered/U
 deliverer/SM
@@ -39086,7 +39086,7 @@ mite/MZRS
 miter/MDG
 mitigate/DSGN
 mitigated/U
-mitigation/M
+mitigation/MS
 mitigatory
 mitochondria
 mitochondrial