Fix typo

01.md

@@ -48,7 +48,7 @@ To prevent implementation differences from creating a different event ID for the
 - No characters except the following should be escaped, and instead should be included verbatim:
   - The line break, `0x0A`, as `\n`
   - A double quote, `0x22`, as `\"`
-  - A backspace, `0x5C`, as `\\`
+  - A backslash, `0x5C`, as `\\`
 - UTF-8 should be used for encoding.
 
 ## Communication between clients and relays