Update 23 pages: Standardize "Requires X" pattern (#4608)

* Standardize requirement wording to "Requires X" pattern

Normalize requirement terminology across all documentation files:
- Signup/Sign-Up Required → Requires Sign-Up
- X VPN Required → Requires X VPN
- X Required → Requires X (Google Login, Library Card, Discord, etc.)

Standardizing phrasing to "Requires X" for improved consistency, scannability, active voice, and easier maintenance.

* fix: grammar

* fix: apply 'Requires X' format after merge with upstream

* fix: standardized leftovers

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Co-authored-by: nbats <44333466+nbats@users.noreply.github.com>

docs/storage.md

@@ -424,7 +424,7 @@
 ## SMS Verification Sites
 
 * ⭐ **[SMSCodeOnline](https://smscodeonline.com/)**
-* ⭐ **[receive-sms-online](https://www.receive-sms-online.info/)** - Sign-Up Required
+* ⭐ **[receive-sms-online](https://www.receive-sms-online.info/)** - Requires Sign-Up
 * ⭐ **[mianfeijiema](https://mianfeijiema.com/)** or [us-phone-number](https://us-phone-number.com/)
 * ⭐ **[sms24](https://www.sms24.me/)**, [2](https://receive-sms.com/)
 * ⭐ **[receive-sms](https://receive-sms.cc/)**