[REQUEST]: update kibana alerting mustache page with EncodeURI and EncodeURIComponent lambdas

### Description

The file [`explore-analyze/alerts-cases/alerts/rule-action-variables.md`](https://github.com/elastic/docs-content/blob/main/explore-analyze/alerts-cases/alerts/rule-action-variables.md) needs to be updated to add secctions for the new `EncodeURI` and `EncodeURIComponent` lambdas added in PR https://github.com/elastic/kibana/pull/213859 . Suggested content in the top comment of that PR.

Current releases this is planned for:

- 8.18.1
- 8.19.0
- 9.0.1
- 9.1.0

### Resources

PR https://github.com/elastic/kibana/pull/213859

### Which documentation set does this change impact?

Elastic On-Prem and Cloud (all)

### Feature differences

identical for all deployment methods

### What release is this request related to?

8.18

### Collaboration model

The engineering team

### Point of contact.

**Main contact:** @pmuellr

**Stakeholders:**