Update bookmarks.md (#256)

Fixed the double-space typo. 

I just copied those two lines as indicated, but the workflow's run jobs kept failing, not realizing that there was extra space. Sadly it took me a couple hours to finally understand what was going on.

It should be updated in case more people struggle with the same issue.

Author: mao1910

docs/key-features/bookmarks.md

@@ -99,8 +99,8 @@ jobs:
 
 - add these lines at the end of the file
 ```
-<!--  daily.dev BOOKMARKS:START -->
-<!--  daily.dev BOOKMARKS:END -->
+<!-- daily.dev BOOKMARKS:START -->
+<!-- daily.dev BOOKMARKS:END -->
 ```
 - Commit the Readme.md file
 - Check if the README file has been updated
@@ -116,4 +116,4 @@ The GitHub action is planned to run every work.This can be changed by adjusting
 
 ![](https://daily-now-res.cloudinary.com/image/upload/v1644219700/docs/bookmarksGithub12.png)
 
-Well done! You have successfully integrated your bookmarks with GitHub.
+Well done! You have successfully integrated your bookmarks with GitHub.