libexec: minor spelling fixes in comments.

No functional change.

libexec/ftpd/ftpd.c

@@ -2048,7 +2048,7 @@ pdata_err:
 	} while (0)
 
 /*
- * Tranfer the contents of "instr" to "outstr" peer using the appropriate
+ * Transfer the contents of "instr" to "outstr" peer using the appropriate
  * encapsulation of the data subject to Mode, Structure, and Type.
  *
  * NB: Form isn't handled.

libexec/ftpd/popen.c

@@ -60,7 +60,7 @@ __FBSDID("$FreeBSD$");
 #define	MAXGLOBARGS	1000
 
 /*
- * Special version of popen which avoids call to shell.  This ensures noone
+ * Special version of popen which avoids call to shell.  This ensures no one
  * may create a pipe to a hidden program as a side effect of a list or dir
  * command.
  */

libexec/rtld-elf/malloc.c

@@ -328,7 +328,7 @@ free(cp)
  * old malloc man page, it realloc's an already freed block.  Usually
  * this is the last block it freed; occasionally it might be farther
  * back.  We have to search all the free lists for the block in order
- * to determine its bucket: 1st we make one pass thru the lists
+ * to determine its bucket: 1st we make one pass through the lists
  * checking only the first block in each; if that fails we search
  * ``realloc_srchlen'' blocks in each list for a match (the variable
  * is extern so the caller can modify it).  If that fails we just copy

libexec/rtld-elf/rtld.c

@@ -822,7 +822,7 @@ origin_subst_one(Obj_Entry *obj, char *real, const char *kw,
 	kw_len = strlen(kw);
 
 	/*
-	 * First, count the number of the keyword occurences, to
+	 * First, count the number of the keyword occurrences, to
 	 * preallocate the final string.
 	 */
 	for (p = real, subst_count = 0;; p = p1 + kw_len, subst_count++) {