Fix 80 typos in comments

(cherry picked from commit 7dca902a85dc02e5df66f0f45a00d1575e7a0220)

src/cmd/ksh93/edit/edit.c

@@ -185,7 +185,7 @@ int tty_get(register int fd, register struct termios *tty)
 				return(SYSERR);
 			errno = 0;
 		}
-		/* save terminal settings if in cannonical state */
+		/* save terminal settings if in canonical state */
 		if(ep->e_raw==0)
 		{
 			ep->e_savetty = *tty;

src/cmd/ksh93/edit/emacs.c

@@ -58,7 +58,7 @@ One line screen editor for any program
  *		- ^X^D command to show any debugging info
  *
  *  I do not pretend these for changes are completely independent,
- *  but you can use them to seperate features.
+ *  but you can use them to separate features.
  */
 
 #include	<ast.h>

src/cmd/ksh93/edit/hexpand.c

@@ -56,8 +56,8 @@ struct subst
  * parse an /old/new/ string, delimiter expected as first char.
  * if "old" not specified, keep sb->str[0]
  * if "new" not specified, set sb->str[1] to empty string
- * read up to third delimeter char, \n or \0, whichever comes first.
- * return adress is one past the last valid char in s:
+ * read up to third delimiter char, \n or \0, whichever comes first.
+ * return address is one past the last valid char in s:
  * - the address containing \n or \0 or
  * - one char beyond the third delimiter
  */
@@ -67,7 +67,7 @@ static char *parse_subst(const char *s, struct subst *sb)
 	char	*cp,del;
 	int	off,n = 0;
 
-	/* build the strings on the stack, mainly for '&' substition in "new" */
+	/* build the strings on the stack, mainly for '&' substitution in "new" */
 	off = staktell();
 
 	/* init "new" with empty string */
@@ -155,7 +155,7 @@ int hist_expand(const char *ln, char **xp)
 		*tmp2=0;/* temporary line buffer */
 	Histloc_t hl;	/* history location */
 	static Namval_t *np = 0;	/* histchars variable */
-	static struct subst	sb = {0,0};	/* substition strings */
+	static struct subst	sb = {0,0};	/* substitution strings */
 	static Sfio_t	*wm=0;	/* word match from !?string? event designator */
 
 	if(!wm)
@@ -620,7 +620,7 @@ getsel:
 						str = cc + strlen(sb.str[0]);
 					}
 					else if(!sftell(tmp2))
-					{	/* not successfull */
+					{	/* not successful */
 						c = *cp;
 						*cp = '\0';
 						errormsg(SH_DICT, ERROR_ERROR,
@@ -641,7 +641,7 @@ getsel:
 			}
 
 			if(sftell(tmp2))
-			{ /* if any substitions done, swap buffers */
+			{ /* if any substitutions done, swap buffers */
 				if(wm != tmp)
 					sfclose(tmp);
 				tmp = tmp2;

src/cmd/ksh93/edit/history.c

@@ -1133,7 +1133,7 @@ char *hist_word(char *string,int size,int word)
 #if SHOPT_ESH
 /*
  * given the current command and line number,
- * and number of lines back or foward,
+ * and number of lines back or forward,
  * compute the new command and line number.
  */