Update Expression-functions.md

Author: mrexodia

introduction/Expression-functions.md

@@ -44,7 +44,7 @@ You may use functions in an expression. The following functions are defined by t
 * `utf8(str)` : A UTF-8 string.
 * `utf16(str)` : A UTF-16 string.
 * `strstr(str1, str2)` : Find a substring. For example, `strstr(utf8(addr), "abc")`.
-* `streq(str1, str2)` : Compare two strings. For example, `strcmp(utf8(addr), "abc")`.
+* `streq(str1, str2)` : Compare two strings. For example, `streq(utf8(addr), "abc")`.
 
 ## Memory