📝 Update documentation

tiny fix, so that command is better copy paste-able.

Also, all of the shell commands have ❯  symbol  when copied, which adds a step of editing when running commands, let me know @OpenWaygate  if you allow me to remove those as well.
--credentials  → --credential

README.md

@@ -48,7 +48,7 @@ Download this credential to your local machine with name `client_secret.json`, i
 To verify this credential, run the following command
 
 ```shell
-❯ yutu auth --credentials client_secret.json
+❯ yutu auth --credential client_secret.json
 ```
 
 A browser window will open asking for your permission to access your YouTube account, after granting the permission, a token will be generated and saved to `youtube.token.json`.
@@ -80,7 +80,7 @@ There are two actions available for yutu, one is for general purpose and the oth
 ### Gopher
 
 ```shell
-❯ go install https://github.com/eat-pray-ai/yutu@latest
+❯ go install github.com/eat-pray-ai/yutu@latest
 ```
 
 ### Linux

cmd/root.go

@@ -10,7 +10,7 @@ import (
 var RootCmd = &cobra.Command{
 	Use:   "yutu",
 	Short: "A fully functional CLI for YouTube",
-	Long:  "yutu is a fully functional CLI for YouTube, which can be used to manupulate YouTube videos, playlists, channels, etc.",
+	Long:  "yutu is a fully functional CLI for YouTube, which can be used to manipulate YouTube videos, playlists, channels, etc.",
 
 	Run: func(cmd *cobra.Command, args []string) {
 		cmd.Help()