docs: correct the format error of the url in 'Connecting via a redis url' section (#2789)

* docs: correct the format error of the url in 'Connecting via a redis url' section

* docs: change secret to password in redis url exmaple

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Co-authored-by: ofekshenawa <104765379+ofekshenawa@users.noreply.github.com>

Author: x1nchen

README.md

@@ -152,7 +152,7 @@ import (
 var ctx = context.Background()
 
 func ExampleClient() {
-    url := "redis://localhost:6379?password=hello&protocol=3"
+    url := "redis://user:password@localhost:6379/0?protocol=3"
     opts, err := redis.ParseURL(url)
     if err != nil {
         panic(err)