[text-auditor] Fix clear typo families in user-facing _meta/fields.yml descriptions

## Text Improvements

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

### 1. Misspelling: `failiure` → `failure`

**File:** `metricbeat/module/linux/conntrack/_meta/fields.yml` (line 15)
**Current text:** `packets dropped due to conntrack failiure`
**Suggested fix:** `packets dropped due to conntrack failure`
**Why:** Clear spelling typo in exported field description text.

### 2. Misspelling: `hexidecimal` → `hexadecimal`

**File:** `x-pack/winlogbeat/module/security/_meta/fields.yml` (line 41)
**Current text:** `description based on the value of the hexidecimal `SubStatus` field.`
**Suggested fix:** `description based on the value of the hexadecimal `SubStatus` field.`
**Why:** Clear spelling typo in exported field description text.

### 3. Misspelling: `mergable` → `mergeable`

**File:** `metricbeat/module/linux/ksm/_meta/fields.yml` (line 31)
**Current text:** `Number of times mergable pages have been scanned.`
**Suggested fix:** `Number of times mergeable pages have been scanned.`
**Why:** Clear spelling typo in exported field description text.

### 4. Misspelling: `respresent` → `represent`

**File:** `metricbeat/module/mongodb/status/_meta/fields.yml` (line 137)
**Current text:** `The possible s are r, w, R and W which respresent shared, exclusive, intent shared and intent exclusive.`
**Suggested fix:** `The possible s are r, w, R and W which represent shared, exclusive, intent shared and intent exclusive.`
**Why:** Clear spelling typo in exported field description text.

### 5. Misspelling: `acccount` → `account`

**File:** `x-pack/metricbeat/module/aws/billing/_meta/fields.yml` (line 9)
**Current text:** `description: Maximum estimated charges for AWS acccount.`
**Suggested fix:** `description: Maximum estimated charges for AWS account.`
**Why:** Clear spelling typo in exported field description text.

### 6. Misspelling: `persitence` → `persistence`

**File:** `metricbeat/module/redis/info/_meta/fields.yml` (line 254)
**Current text:** `Provides information about AOF persitence`
**Suggested fix:** `Provides information about AOF persistence`
**Why:** Clear spelling typo in exported field description text.

## Suggested Actions

- [ ] Update `metricbeat/module/linux/conntrack/_meta/fields.yml:15` to use `failure`.
- [ ] Update `x-pack/winlogbeat/module/security/_meta/fields.yml:41` to use `hexadecimal`.
- [ ] Update `metricbeat/module/linux/ksm/_meta/fields.yml:31` to use `mergeable`.
- [ ] Update `metricbeat/module/mongodb/status/_meta/fields.yml:137` to use `represent`.
- [ ] Update `x-pack/metricbeat/module/aws/billing/_meta/fields.yml:9` to use `account`.
- [ ] Update `metricbeat/module/redis/info/_meta/fields.yml:254` to use `persistence`.

## Completeness and duplicate-check notes

- Completeness pass patterns: `failiure`, `hexidecimal`, `mergable`, `respresent`, `acccount`, `persitence`.
- All verified non-generated in-scope occurrences for these patterns are included above.
- Existing open `[text-auditor]` issues already track other typo families (for example `defauling`, `Elastisearch`, `successully`, `occured`, `colon-seperated`, and duplicated-word docs families), so those were intentionally excluded from this report.

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