cmd/go/internal/modget: s/prerelease/pre-release/

For prose consistency with other documentation.

Change-Id: I1588fbe1feace2a97b02b20bba730ed730b84fa3
Reviewed-on: https://go-review.googlesource.com/c/go/+/171772
Run-TryBot: Ross Light <light@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>

src/cmd/go/alldocs.go

@@ -549,7 +549,7 @@
 // For each named package or package pattern, get must decide which version of
 // the corresponding module to use. By default, get chooses the latest tagged
 // release version, such as v0.4.5 or v1.2.3. If there are no tagged release
-// versions, get chooses the latest tagged prerelease version, such as
+// versions, get chooses the latest tagged pre-release version, such as
 // v0.0.1-pre1. If there are no tagged versions at all, get chooses the latest
 // known commit.
 //

src/cmd/go/internal/modget/get.go

@@ -39,7 +39,7 @@ The first step is to resolve which dependencies to add.
 For each named package or package pattern, get must decide which version of
 the corresponding module to use. By default, get chooses the latest tagged
 release version, such as v0.4.5 or v1.2.3. If there are no tagged release
-versions, get chooses the latest tagged prerelease version, such as
+versions, get chooses the latest tagged pre-release version, such as
 v0.0.1-pre1. If there are no tagged versions at all, get chooses the latest
 known commit.