Linux,Windows: title GOOS pages consistently

Most GOOS wiki pages use a title of the form "Go on GOOS". Update the
outliers to match this format.

Change-Id: I6a6a636c89f23468f63ff0bb2dd6eb6b1d68901d
Reviewed-on: https://go-review.googlesource.com/c/wiki/+/749005
Auto-Submit: Michael Pratt <mpratt@google.com>
Reviewed-by: Sean Liao <sean@liao.dev>