Modify comment syntax error

Author: wanghaha-dev

echo.go

@@ -565,7 +565,7 @@ func (e *Echo) Group(prefix string, m ...MiddlewareFunc) (g *Group) {
 	return
 }
 
-// URI generates a URI from handler.
+// URI generates an URI from handler.
 func (e *Echo) URI(handler HandlerFunc, params ...interface{}) string {
 	name := handlerName(handler)
 	return e.Reverse(name, params...)

middleware/slash.go

@@ -33,7 +33,7 @@ func AddTrailingSlash() echo.MiddlewareFunc {
 	return AddTrailingSlashWithConfig(DefaultTrailingSlashConfig)
 }
 
-// AddTrailingSlashWithConfig returns a AddTrailingSlash middleware with config.
+// AddTrailingSlashWithConfig returns an AddTrailingSlash middleware with config.
 // See `AddTrailingSlash()`.
 func AddTrailingSlashWithConfig(config TrailingSlashConfig) echo.MiddlewareFunc {
 	// Defaults