Update index.mdx (#465)

Author: hey-august

website/docs/main/home/messaging/sms/guides/general/messaging-character-limits/index.mdx

@@ -14,7 +14,7 @@ What is a Message Segment?
 
 A message segment is a part of an entire message that has been broken down into several pieces. If the body of the message is larger than 160 GSM-7 characters or 70 UCS-2 characters, it will automatically be broken up into smaller messages and annotated to attempt proper reconstruction on the recipient handset. Not all carriers and handsets support this. You can have a maximum of 1600 characters in an SMS body. 
 
- SignalWire will recombine inbound messages into a single message. **Your project will be charged for each segment sent or received except for inbound SMS (not MMS) which are free of cost.**
+ SignalWire will recombine inbound messages into a single message. **Your project will be charged for each segment sent or received.**
 
 
 :::info Hidden Characters that Might Affect Character Count