Fix formatting and punctuation in README.md

Author: CyberSam7

README.md

@@ -2,7 +2,7 @@
 
 Signal is a simple, powerful, and secure messenger.
 
-Signal uses your phone's data connection (WiFi/3G/4G/5G) to communicate securely. Millions of people use Signal every day for free and instantaneous communication anywhere in the world. Send and receive high-fidelity messages, participate in HD voice/video calls, and explore a growing set of new features that help you stay connected. Signal’s advanced privacy-preserving technology is always enabled, so you can focus on sharing the moments that matter with the people who matter to you.
+Signal uses your phone’s data connection (Wi‑Fi / 3G / 4G / 5G) to communicate securely. to communicate securely. Millions of people use Signal every day for free and instantaneous communication anywhere in the world. Send and receive high-fidelity messages, participate in HD voice/video calls, and explore a growing set of new features that help you stay connected. Signal’s advanced privacy-preserving technology is always enabled, so you can focus on sharing the moments that matter with the people who matter to you.
 
 Currently available on the Play Store and [signal.org](https://signal.org/android/apk/).