Fixed typo - cleanup documentation

fixed typo - synchronised to synchronized

Change-Id: I7c2ce11f68853cb5102c5bccb80c0b2c747e2ad7
Added complete Doc Conventions in Install Guide.

backport: havana

Change-Id: Icd74a1a4db8ec477e48d49475c405d3b09e52c1c
Partial-Bug: #1121866
Merge "Added complete Doc Conventions in Install Guide."
Merge "Fixed typo - cleanup documentation"