SPP docs diff scan web requests feature flag

What does this MR do and why?

Following the merge of !178726 (merged), Web IDE pushes are now able to be diff-scanned.

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Before	After

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doc/user/application_security/secret_detection/secret_push_protection/_index.md

@@ -139,6 +139,7 @@ Secret push protection does not check a file in a commit when:
 
 - [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/469161) in GitLab 17.5 [with a flag](../../../../administration/feature_flags.md) named `spp_scan_diffs`. Disabled by default.
 - [Enabled on GitLab.com](https://gitlab.com/gitlab-org/gitlab/-/issues/480092) in GitLab 17.6.
+- [Added](https://gitlab.com/gitlab-org/gitlab/-/issues/491282) support for Web IDE pushes in GitLab 17.10 [with a flag](../../../../administration/feature_flags.md) named `secret_checks_for_web_requests`. Disabled by default.
 
 {{< /history >}}
 
@@ -154,9 +155,8 @@ cause a [push to be blocked unexpectedly](#push-blocked-unexpectedly) even thoug
 contain a secret. To instead have only the changes (diff) scanned for secrets when pushing by using
 the Git CLI client, enable diff scanning.
 
-Changes committed by using the Web IDE still result in the entire file being scanned due to a
-technical limitation. Support for improvements is proposed in
-[issue 491282](https://gitlab.com/gitlab-org/gitlab/-/issues/491282).
+To enable diff-only scanning for Web IDE pushes, enable the `secret_checks_for_web_requests`
+and `spp_scan_diffs` feature flags.
 
 ## Resolve a blocked push