Adjusted code copy button documentation

Co-authored-by: thorstenpeter-sophos <[email protected]>

Author: squidfunk

docs/reference/code-blocks.md

@@ -71,16 +71,19 @@ theme:
     ```
     ````
 
-    Note that the language shortcode which has to come first must now also be
-    prefixed by a `.`. Similarly, the copy button can also be disabled for a
-    specific code block:
+    Note that there must be a language shortcode, which has to come first and
+    must also be prefixed by a `.`. Similarly, the copy button can also be
+    disabled for a specific code block:
 
     ```` { .yaml .no-copy }
     ``` { .yaml .no-copy }
     # Code block content
     ```
     ````
 
+    To enable or disable the copy button without syntax highlighting, you can
+    use the `.text` language shortcode, which doesn't highlight anything.
+
 ### Code selection button
 
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