Please capitalize where necessary: room: this room is very bright and can accommodate 1 person since it is furnished with one single bed.
A: Room: This room is very bright and can accommodate 1 person since it is furnished with one single bed.

Please capitalize where necessary: output voltage: 30 v dc
A: Output voltage: 30 V DC

Please capitalize where necessary: ~ canadians canoes (2-or 3-persons aluminium canoes or the always trusted polyester inka trapper)
A: ~ Canadians canoes (2-or 3-persons aluminium canoes or the always trusted polyester Inka Trapper)

Please capitalize where necessary: before you can open a s3i file, you'll need to figure out what kind of file the s3i file extension refers to.
A:
Before you can open a S3I file, you'll need to figure out what kind of file the S3I file extension refers to.