Fix spelling/wording issues.

From Alan Coopersmith in xdm

app/xenodm/include/greet.h

@@ -34,7 +34,7 @@ from The Open Group.
 
 /*
  * Return values for GreetUser();
- * Values must be explictly defined because the greet library
+ * Values must be explicitly defined because the greet library
  * may come from a different vendor.
  * Negative values indicate an error.
  */
@@ -50,7 +50,7 @@ typedef enum {
  * should start a session.
  *
  * GreetUser is passed the xdm struct display pointer, a pointer to a
- * Display, and pointers to greet and verify structs.  If it expectes xdm
+ * Display, and pointers to greet and verify structs.  If it expects xdm
  * to run the session, it fills in the Display pointer and the fields
  * of the greet and verify structs.
  *

app/xenodm/xenodm/auth.c

@@ -153,7 +153,7 @@ CleanUpFileName (char *src, char *dst, int len)
 }
 
 /* Checks to see if specified directory exists, makes it if not
- * Returns: 0 if already exists, 1 if created, < 0 if error occured
+ * Returns: 0 if already exists, 1 if created, < 0 if error occurred
  */
 static int
 CheckServerAuthDir (const char *path, struct stat *statb, int mode)

app/xenodm/xenodm/dm.c

@@ -257,7 +257,7 @@ StopAll (int n)
     {
 	/*
 	 * We are a child xdm process that was killed by the
-	 * master xdm before we were able to return from fork()
+	 * parent xdm before we were able to return from fork()
 	 * and remove this signal handler.
 	 *
 	 * See defect XWSog08655 for more information.