Review and Update Scan rules page with the new scan rules

### Description

> $Subject

Page: https://ballerina.io/learn/scan-rules/
Relevant document: https://github.com/ballerina-platform/ballerina-dev-website/blob/master/swan-lake/development-tutorials/static-code-analysis/scan-rules.md

### Version

Ballerina SwanLake Update 12