fix: details optimize

Signed-off-by: Xinwei Xiong(cubxxw-openim) <3293172751nss@gmail.com>

.gitmodules

@@ -1,4 +0,0 @@
-
-[submodule "cmd/Open-IM-SDK-Core"]
-	path = cmd/Open-IM-SDK-Core
-	url = https://github.com/OpenIMSDK/Open-IM-SDK-Core.git

install_guide.sh

@@ -43,7 +43,7 @@ edit_config() {
       vi config/config.yaml
     ;;
     2)
-      echo "do not edit config"    
+      echo "do not edit config"
     ;;
     esac
 }
@@ -174,4 +174,3 @@ case $choice in
     echo "Invalid option, please try again."
     ;;
 esac
-