Fix typo

Author: th-otto

gemdos/prozess/psignal.ui

@@ -64,7 +64,7 @@ a signal-handler will be reset in the child process to the default value.
 The function returns the old value of the signal-handler. This is either 0,
 1 or the address of the handler.
 
-Im case of error, the following results are returned:
+In case of error, the following results are returned:
 
 !begin_xlist !compressed [ERANGE:]
 !item [EACCDN:]