golang: Fix typo about gowork-snapshot

My mistake from 1b540151 (golang: Infrastructure to build Go workspaces / projects)

/reviewed-by TrustMe

component/golang/buildout.cfg

@@ -115,7 +115,7 @@ git-executable = ${git:location}/bin/git
 # 3) provide repository (which is not the same as importpath in general case)
 #
 # the list of go packages for a go workspace state can be automatically
-# generated with the help of go-pkg-snapshot tool.
+# generated with the help of gowork-snapshot tool.
 [go-git-package]
 <= git-repository
 location = ${gowork:src}/${:go.importpath}