Known issue update-readme

[vishalhcl-5960]

Listed a known issue in the readme file.

[mattmurp]

We should make this message more clear. It's confusing as written, since users may not know what we mean by "Git repository scan". Something like:

"Scans created using the "Scan GitHub repository" feature in the AppScan on Cloud web interface are not supported for rescan in the Jenkins Plugin."

We should add a note about the error that will be seen if this is done and what will happen (i.e. the build will not fail and the results from the last run will be shown).

[vishalhcl-5960]

We should make this message more clear. It's confusing as written, since users may not know what we mean by "Git repository scan". Something like:

"Scans created using the "Scan GitHub repository" feature in the AppScan on Cloud web interface are not supported for rescan in the Jenkins Plugin."

We should add a note about the error that will be seen if this is done and what will happen (i.e. the build will not fail and the results from the last run will be shown).

Sure, Made the changes accordingly.