text/template: reword uncover to unwrap
Matches the preceding "wrap" terminology.
Change-Id: Ia783de578c2942fe1474281c3d6056b1074d41b0
GitHub-Last-Rev:
4fcff4e9b2836d428ba668186441089a9618c028
GitHub-Pull-Request: golang/go#59891
Reviewed-on: https://go-review.googlesource.com/c/go/+/490675
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Ian Lance Taylor <iant@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Carlos Amedee <carlos@golang.org>