fix doc for semantic token (#4011)

Author: soulomoon

docs/features.md

@@ -385,9 +385,7 @@ Known limitations:
 
 Provided by: `hls-semantic-tokens-plugin`
 
-Provides semantic tokens for each token to support semantic highlighting.
-
-![Semantic Tokens Demo](https://private-user-images.githubusercontent.com/14073857/290981908-9619fae2-cb92-4d4e-b8f8-6507851ba9f3.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.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.n-CL6e2R0TWHpmzVo1i60QEDczTEJ-8zvQWxjaBsnks)
+Provides semantic tokens for each token in the source code to support semantic highlighting.
 
 ## Rewrite to overloaded record syntax