[text-auditor] Batch fix clear untracked typo families in Redis, Sophos, and SNS rule text

## Text Improvements

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

### 1. `memeory` typo family in Redis metric label (2 occurrences)

**File:** `packages/redis/data_stream/info/fields/fields.yml` (line 141)
**Current text:** `Active memeory`
**Suggested fix:** `Active memory`
**Why:** Clear typo in a user-facing field description.

**File:** `packages/redis/docs/README.md` (line 301)
**Current text:** `Active memeory`
**Suggested fix:** `Active memory`
**Why:** Same typo in generated user-facing docs.

### 2. `messsage` typo family in Sophos XG signature label (2 occurrences)

**File:** `packages/sophos/data_stream/xg/fields/fields.yml` (line 614)
**Current text:** `Signature messsage`
**Suggested fix:** `Signature message`
**Why:** Clear typo in user-facing field text.

**File:** `packages/sophos/docs/README.md` (line 1057)
**Current text:** `Signature messsage`
**Suggested fix:** `Signature message`
**Why:** Same typo in generated user-facing docs.

### 3. Typos in AWS SNS security rule description text (3 files)

**File:** `packages/security_detection_engine/kibana/security_rule/3df49ff6-985d-11ef-88a1-f661ea17fbcd_8.json` (line 6)
**Current text:** `Identifies when a use subscribes to an SNS topic ...`
**Suggested fix:** `Identifies when a user subscribes to an SNS topic ...`
**Why:** Clear typo in rule description visible to users.

**File:** `packages/security_detection_engine/kibana/security_rule/3df49ff6-985d-11ef-88a1-f661ea17fbcd_8.json` (line 6)
**Current text:** `... subscribe to recieve topic messages ...`
**Suggested fix:** `... subscribe to receive topic messages ...`
**Why:** Clear typo in user-facing rule description.

**File:** `packages/security_detection_engine/kibana/security_rule/3df49ff6-985d-11ef-88a1-f661ea17fbcd_9.json` (line 6)
**Current text:** `... subscribe to recieve topic messages ...`
**Suggested fix:** `... subscribe to receive topic messages ...`
**Why:** Same typo in another versioned rule file.

**File:** `packages/security_detection_engine/kibana/security_rule/3df49ff6-985d-11ef-88a1-f661ea17fbcd_10.json` (line 6)
**Current text:** `... subscribe to recieve topic messages ...`
**Suggested fix:** `... subscribe to receive topic messages ...`
**Why:** Same typo in another versioned rule file.

## Suggested Actions

- [ ] Replace `memeory` with `memory` in both Redis source/docs occurrences listed above.
- [ ] Replace `messsage` with `message` in both Sophos XG source/docs occurrences listed above.
- [ ] Replace `use` → `user` and `recieve` → `receive` in the listed SNS rule description files.

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