Update run-functions-from-deployment-package.md

After fighting a bit with the `func` CLI I discovered that `SCM_DO_BUILD_DURING_DEPLOYMENT=true` setting is always ignored when `WEBSITE_RUN_FROM_PACKAGE` setting is set.
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cc: @ggailey777

Author: sinedied

articles/azure-functions/run-functions-from-deployment-package.md

@@ -60,6 +60,7 @@ The following shows a function app configured to run from a .zip file hosted in
 - Tar and gzip formats are not supported.
 - This feature does not compose with local cache.
 - For improved cold-start performance, use the local Zip option (`WEBSITE_RUN_FROM_PACKAGE`=1).
+- Run From Package is incompatible with deployment customization option (`SCM_DO_BUILD_DURING_DEPLOYMENT=true`), the build step will be ignored during deployment.
 
 ## Next steps