Update changelog for M7

...and M6 and M5...

Change-Id: I5f900e6e4ab4807491dbd783f69caae9792b3ab1
Fix changelog typos

Change-Id: If217913697ccde09e3eeb8ae32b5bb429c925b1c
Merge remote-tracking branch 'CM/cm-11.0' into cm-11.0