[text-auditor] Batch fix untracked typo/grammar issues in package and CI user-facing text

## Text Improvements

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

### 1. Typo family: `x-forwaded-proto` → `x-forwarded-proto`

**File:** `packages/forgerock/data_stream/am_access/fields/forgerock-fields.yml` (line 110)
**Current text:** `The x-forwaded-proto header of the HTTP request.`
**Suggested fix:** `The x-forwarded-proto header of the HTTP request.`
**Why:** Clear typo in user-facing field description.

**Also occurs in:**
- `packages/forgerock/docs/README.md` (line 136)

### 2. Typo: `paramater` → `parameter`

**File:** `packages/o365_metrics/docs/README.md` (line 83)
**Current text:** `By default, this paramater is \`3\`.`
**Suggested fix:** `By default, this parameter is \`3\`.`
**Why:** Clear spelling error in user-facing documentation.

### 3. Grammar: `a Elastic` → `an Elastic`

**File:** `docs/ci_pipelines.md` (line 7)
**Current text:** `...using a Elastic Serverless project.`
**Suggested fix:** `...using an Elastic Serverless project.`
**Why:** Clear article-agreement grammar error.

### 4. Misleading text: pipeline count does not match list

**File:** `docs/ci_pipelines.md` (line 5)
**Current text:** `Currently, there are five different pipelines:`
**Suggested fix:** `Currently, there are six different pipelines:`
**Why:** The list immediately below contains six pipelines, so current wording is directly contradictory.

### 5. Grammar: subject-verb agreement

**File:** `docs/extend/tips-for-building.md` (line 229)
**Current text:** `...a service which write the sample logs...`
**Suggested fix:** `...a service which writes the sample logs...`
**Why:** Clear subject-verb agreement error.

## Suggested Actions

- [ ] Replace `x-forwaded-proto` with `x-forwarded-proto` in both listed ForgeRock files.
- [ ] Fix `paramater` to `parameter` in `packages/o365_metrics/docs/README.md`.
- [x] Update `a Elastic` to `an Elastic` in `docs/ci_pipelines.md`.
- [x] Correct the pipeline count in `docs/ci_pipelines.md` from five to six.
- [x] Change `which write` to `which writes` in `docs/extend/tips-for-building.md`.

> [!NOTE]
>
> 🔒 Integrity filter blocked 1 item
>
> The following item were blocked because they don't meet the GitHub integrity level.
>
> - [#16136](https://github.com/elastic/integrations/issues/16136) `search_issues`: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
>
> To allow these resources, lower `min-integrity` in your GitHub frontmatter:
>
> ```yaml
> tools:
> github:
> min-integrity: approved # merged | approved | unapproved | none
> ```
>
>

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> - [x] expires on May 11, 2026, 10:49 AM UTC