[text-auditor] Batch fix clear typo families in package changelog user-facing text

## Text Improvements

The following user-facing text issues were found in package changelogs. These are low-effort, unambiguous fixes.

### 1. Typo family: `Modifed` → `Modified` (9 occurrences)

**Why:** Clear spelling error in changelog descriptions shown to users.

**File:** `packages/airflow/changelog.yml` (line 79)
**Current text:** `Modifed the dimension field mapping to support public cloud deployment.`
**Suggested fix:** `Modified the dimension field mapping to support public cloud deployment.`

**File:** `packages/cockroachdb/changelog.yml` (line 73)
**Current text:** `Modifed the dimension field mapping to support public cloud deployment.`
**Suggested fix:** `Modified the dimension field mapping to support public cloud deployment.`

**File:** `packages/couchdb/changelog.yml` (line 59)
**Current text:** `Modifed the dimension field mapping to support public cloud deployment.`
**Suggested fix:** `Modified the dimension field mapping to support public cloud deployment.`

**File:** `packages/influxdb/changelog.yml` (line 44)
**Current text:** `Modifed the dimension field mapping to support public cloud deployment.`
**Suggested fix:** `Modified the dimension field mapping to support public cloud deployment.`

**File:** `packages/kafka/changelog.yml` (line 169)
**Current text:** `Modifed the dimension field mapping to support public cloud deployment.`
**Suggested fix:** `Modified the dimension field mapping to support public cloud deployment.`

**File:** `packages/mysql/changelog.yml` (line 159)
**Current text:** `Modifed the dimension field mapping to support public cloud deployment.`
**Suggested fix:** `Modified the dimension field mapping to support public cloud deployment.`

**File:** `packages/nginx/changelog.yml` (line 144)
**Current text:** `Modifed the dimension field mapping to support public cloud deployment.`
**Suggested fix:** `Modified the dimension field mapping to support public cloud deployment.`

**File:** `packages/rabbitmq/changelog.yml` (line 83)
**Current text:** `Modifed the dimension field mapping to support public cloud deployment.`
**Suggested fix:** `Modified the dimension field mapping to support public cloud deployment.`

**File:** `packages/redis/changelog.yml` (line 74)
**Current text:** `Modifed the dimension field mapping to support public cloud deployment.`
**Suggested fix:** `Modified the dimension field mapping to support public cloud deployment.`

### 2. Typo family: `vulnerablity` / `vulnerabilites` → `vulnerability` / `vulnerabilities` (3 occurrences)

**Why:** Clear spelling errors in changelog descriptions.

**File:** `packages/tenable_sc/changelog.yml` (line 27)
**Current text:** `Fix handling of vulnerablity documents that do not contain a seeAlso field.`
**Suggested fix:** `Fix handling of vulnerability documents that do not contain a seeAlso field.`

**File:** `packages/tenable_sc/changelog.yml` (line 62)
**Current text:** `Update lastSeen parameter format in vulnerablity data-stream.`
**Suggested fix:** `Update lastSeen parameter format in vulnerability data-stream.`

**File:** `packages/tenable_io/changelog.yml` (line 54)
**Current text:** `Add a filter to select the severity level of collected vulnerabilites.`
**Suggested fix:** `Add a filter to select the severity level of collected vulnerabilities.`

### 3. Typo: `Seperate` → `Separate` (1 occurrence)

**Why:** Clear spelling error in changelog description.

**File:** `packages/cloud_security_posture/changelog.yml` (line 389)
**Current text:** `Seperate KSPM and CSPM cloudformation templates`
**Suggested fix:** `Separate KSPM and CSPM cloudformation templates`

## Suggested Actions

- [ ] Replace `Modifed` with `Modified` in all 9 listed changelog entries.
- [ ] Replace `vulnerablity`/`vulnerabilites` with correct spellings in all 3 listed entries.
- [ ] Replace `Seperate` with `Separate` in `packages/cloud_security_posture/changelog.yml`.

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