analysisflags: quote analyzer name in enable usage

Update the help text for analyzer flags to quote the analyzer
name (e.g., enable "any" analysis), avoiding ambiguity for
analyzers such as "any".

Fixes golang/go#77679

Change-Id: Iad7ccccba7a9616e2d0e3b9093fea8fcbc1c1bd9
Reviewed-on: https://go-review.googlesource.com/c/tools/+/748320
Reviewed-by: Madeline Kalil <mkalil@google.com>
Reviewed-by: Alan Donovan <adonovan@google.com>
Commit-Queue: Alan Donovan <adonovan@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

Author: BasavarajBankolli

go/analysis/internal/analysisflags/flags.go

@@ -52,7 +52,7 @@ func Parse(analyzers []*analysis.Analyzer, multi bool) []*analysis.Analyzer {
 			prefix = a.Name + "."
 
 			enable := new(triState)
-			enableUsage := "enable " + a.Name + " analysis"
+			enableUsage := fmt.Sprintf("enable %q analysis", a.Name)
 			flag.Var(enable, a.Name, enableUsage)
 			enabled[a] = enable
 		}