[autofix.ci] apply automated fixes

Author: autofix-ci[bot]

docs/syntax/sequenceDiagram.md

@@ -921,6 +921,20 @@ sequenceDiagram
     Bob-->Alice: Hi Alice
 ```
 
+```mermaid-example
+sequenceDiagram
+    autonumber 1.5 0.25
+    Alice->Bob: Hello Bob
+    Bob-->Alice: Hi Alice
+```
+
+```mermaid
+sequenceDiagram
+    autonumber 1.5 0.25
+    Alice->Bob: Hello Bob
+    Bob-->Alice: Hi Alice
+```
+
 ## Actor Menus
 
 Actors can have popup-menus containing individualized links to external pages. For example, if an actor represented a web service, useful links might include a link to the service health dashboard, repo containing the code for the service, or a wiki page describing the service.