Fix typo

Author: Jan-Olof Hendig

doc/Language/ipc.pod6

@@ -77,7 +77,7 @@ ability to send signals to that program.
     await $done;
 
 Here is a small program that uses the "tail" program to print out the contents
-of the log named F<system.log> for 10 seconds and then tells the program to stop
+of the log named C<system.log> for 10 seconds and then tells the program to stop
 with a QUIT signal.
 
 Whereas C<Proc> provides access to output using C<IO::Handle>s, C<Proc::Async>