[text-auditor] Fix clear docs typos and a Buildkite benchmark message grammar error

## Text Improvements

The following user-facing text issues were found in the repository. Each is a low-effort fix.

### 1. Incorrect ECS field name typo in docs example

**File:** `docs/extend/add-mapping.md` (line 97)
**Current text:** ``- name: cloud.acount.id``
**Suggested fix:** ``- name: cloud.account.id``
**Why:** Clear typo in a field-name example (`acount` → `account`). This can mislead users copying the example.

### 2. Clear typo in docs prose

**File:** `docs/extend/developer-workflow-import-beat.md` (line 158)
**Current text:** `* **multi** - the field has mutliple values.`
**Suggested fix:** `* **multi** - the field has multiple values.`
**Why:** Clear spelling error (`mutliple` → `multiple`).

### 3. Ungrammatical Buildkite user-visible message

**File:** `.buildkite/scripts/process_benchmarks.sh` (line 55)
**Current text:** `echo "[benchmarks] Not found baseline benchmarks"`
**Suggested fix:** `echo "[benchmarks] Baseline benchmarks not found"`
**Why:** Current wording is grammatically incorrect and less clear in CI output.

## Suggested Actions

- [ ] Replace `cloud.acount.id` with `cloud.account.id` in `docs/extend/add-mapping.md`.
- [ ] Replace `mutliple` with `multiple` in `docs/extend/developer-workflow-import-beat.md`.
- [ ] Reword the benchmark message to `Baseline benchmarks not found` in `.buildkite/scripts/process_benchmarks.sh`.

---
[What is this?](https://ela.st/github-ai-tools) | [From workflow: Text Auditor](https://github.com/elastic/integrations/actions/runs/26947814765)

Give us feedback! React with 🚀 if perfect, 👍 if helpful, 👎 if not.
> - [x] expires on Jun 11, 2026, 11:12 AM UTC