internal/cueversion: bump fallbackVersion for v0.8.0-rc.1

While here, tweak the godocs with https://sembr.org/ for readability.

Signed-off-by: Daniel Martí <mvdan@mvdan.cc>
Change-Id: I38501589c2db7e0f6c07d61af17a720c62535bbb
Reviewed-on: https://review.gerrithub.io/c/cue-lang/cue/+/1178185
Reviewed-by: Roger Peppe <rogpeppe@gmail.com>
TryBot-Result: CUEcueckoo <cueckoo@gmail.com>
Unity-Result: CUE porcuepine <cue.porcuepine@gmail.com>

internal/cueversion/version.go

@@ -10,18 +10,16 @@ import (
 	"sync"
 )
 
-// fallbackVersion is used when there isn't a recorded main module
-// version, for example when building via `go install ./cmd/cue`. It
-// should reflect the last release in the current branch.
+// fallbackVersion is used when there isn't a recorded main module version,
+// for example when building via `go install ./cmd/cue`.
+// It should reflect the last release in the current branch.
 //
 // TODO: remove once Go stamps local builds with a main module version
-// derived from the local VCS information per
-// https://go.dev/issue/50603.
-const fallbackVersion = "v0.8.0-alpha.5"
+// derived from the local VCS information per https://go.dev/issue/50603.
+const fallbackVersion = "v0.8.0-rc.1"
 
-// Version returns the version of the cuelang.org/go module as best
-// as can reasonably be determined. The result is always a valid Go
-// semver version.
+// Version returns the version of the cuelang.org/go module as best as can
+// reasonably be determined. The result is always a valid Go semver version.
 func Version() string {
 	return versionOnce()
 }