improve doc comments

Signed-off-by: Alex Goodman <alex.goodman@anchore.com>

internal/version/build.go

@@ -1,3 +1,6 @@
+/*
+Package version contains all build time metadata (version, build time, git commit, etc).
+*/
 package version
 
 import (

internal/version/update.go

@@ -18,6 +18,7 @@ var latestAppVersionURL = struct {
 	path: fmt.Sprintf("/%s/releases/latest/VERSION", internal.ApplicationName),
 }
 
+// IsUpdateAvailable indicates if there is a newer application version available, and if so, what the new version is.
 func IsUpdateAvailable() (bool, string, error) {
 	currentVersionStr := FromBuild().Version
 	currentVersion, err := hashiVersion.NewVersion(currentVersionStr)