Fix README typo.

Author: antirez

README.md

@@ -11,7 +11,7 @@ Keys:
 
     CTRL-S: Save
     CTRL-Q: Quit
-    CTRL-F: Find string in file (ESC to esc, arrows to navigate)
+    CTRL-F: Find string in file (ESC to exit search, arrows to navigate)
 
 Kilo does not depend on any library (not even curses). It uses fairly standard
 VT100 (and similar terminals) escape sequences. The project is in alpha