chore: Update sast docs dropping mention of `SAST_DISABLE_BABEL`

Merged Lucas Charles requested to merge theoretick-master-patch-42430 into master

What does this MR do?

Drops mention of SAST_DISABLE_BABEL variable which was dropped in %13.5 and we have forgotten to remove it.

Relates to gitlab-org/security-products/analyzers/nodejs-scan!80 (diffs)

Does this MR meet the acceptance criteria?

Conformity

Availability and Testing

Security

Does this MR contain changes to processing or storing of credentials or tokens, authorization and authentication methods or other items described in the security review guidelines? If not, then delete this Security section.

  • Label as security and @ mention @gitlab-com/gl-security/appsec
  • The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
  • Security reports checked/validated by a reviewer from the AppSec team