Fix links in RELEASES.md for 1.10.0 through 1.12.0
Fix links in RELEASES.md for 1.10.0 through 1.12.0

Many links in this series have the `[link text]` and `(url)` on separate
lines, which doesn't get correctly interpreted in markdown.  Or maybe it
once did, but it doesn't now.  This patch joins the lines together.

GBGamer/rust,aidancully/rust,GBGamer/rust,GBGamer/rust,GBGamer/rust,aidancully/rust,GBGamer/rust,graydon/rust,GBGamer/rust,graydon/rust,aidancully/rust,aidancully/rust,aidancully/rust,graydon/rust,GBGamer/rust,GBGamer/rust,aidancully/rust,graydon/rust,graydon/rust,graydon/rust