Fix various minor problems and update the documentation (#237)

These are minor fixes I've accumulated over time. The following
changes are somewhat notable:

- Added a missing entry for 'typeset -s' to the man page.
- Add strftime(3) to the 'see also' section. This and the date(1)
  addition are meant to add onto the documentation for 'printf %T'.
- Removed the man page the entry for ksh reading $PWD/.profile on
  login. That feature was removed in commit aa7713c2.
- Added date(1) to the 'see also' section of the man page.
- Note that the 'hash' command can be used instead of 'alias -t' to
  workaround one of the caveats listed in the man page.
- Use an 'out of memory' error message rather than 'out of space'
  when memory allocation fails.
- Replaced backticks with quotes in some places for consistency.
- Added missing documentation for the %P date format.
- Added missing documentation for the printf %Q and %p formats
  (backported from ksh2020: https://github.com/att/ast/pull/1032).
- The comments that show each builtin's options have been updated.

src/cmd/ksh93/edit/edit.c

@@ -1192,7 +1192,7 @@ void	ed_putchar(register Edit_t *ep,register int c)
 #if SHOPT_ESH || SHOPT_VSH
 /*
  * returns the line and column corresponding to offset <off> in the physical buffer
- * if <cur> is non-zero and <= <off>, then correspodning <curpos> will start the search 
+ * if <cur> is non-zero and <= <off>, then corresponding <curpos> will start the search
  */
 Edpos_t ed_curpos(Edit_t *ep,genchar *phys, int off, int cur, Edpos_t curpos)
 {

src/cmd/ksh93/edit/emacs.c

@@ -101,7 +101,7 @@ One line screen editor for any program
 #   define print(c)	isprint(c)
 #   define isword(c)	(isalnum(out[c]) || (out[c]=='_'))
 #   define digit(c)	isdigit(c)
-#endif /*SHOPT_MULTIBYTE */
+#endif /* SHOPT_MULTIBYTE */
 
 typedef struct _emacs_
 {
@@ -1461,11 +1461,11 @@ static void draw(register Emacs_t *ep,Draw_t option)
 		drawbuff[cur+1]=0;
 #   if SHOPT_MULTIBYTE
 		ed_external(drawbuff,(char*)drawbuff);
-#   endif /*SHOPT_MULTIBYTE */
+#   endif /* SHOPT_MULTIBYTE */
 		n = ed_histgen(ep->ed,(char*)drawbuff);
 #   if SHOPT_MULTIBYTE
 		ed_internal((char*)drawbuff,drawbuff);
-#   endif /*SHOPT_MULTIBYTE */
+#   endif /* SHOPT_MULTIBYTE */
 		if(ep->ed->hlist)
 		{
 			ed_histlist(ep->ed,n);

src/cmd/ksh93/edit/history.c

@@ -200,7 +200,7 @@ done:
 	return(r);
 	
 }
-#endif /*SHOPT_AUDIT*/
+#endif /* SHOPT_AUDIT */
 
 static const unsigned char hist_stamp[2] = { HIST_UNDO, HIST_VERSION };
 static const Sfdisc_t hist_disc = { NULL, hist_write, NULL, hist_exceptf, NULL};

src/cmd/ksh93/edit/vi.c

@@ -297,7 +297,7 @@ int ed_viread(void *context, int fd, register char *shbuf, int nchar, int reedit
 			/*** ESC was typed as first char of line ***/
 			esc_or_hang = 1;
 			term_char = ESC;
-			shbuf[i--] = '\0';	/* null terminate line */
+			shbuf[i--] = '\0';	/* null-terminate line */
 		}
 		else if( i<0 || c==usreof )
 		{
@@ -321,12 +321,12 @@ int ed_viread(void *context, int fd, register char *shbuf, int nchar, int reedit
 #endif
 			if( term_char=='\n' || term_char==usreof )
 			{
-				/*** remove terminator & null terminate ***/
+				/*** remove terminator & null-terminate ***/
 				shbuf[i--] = '\0';
 			}
 			else
 			{
-				/** terminator was ESC, which is not xmitted **/
+				/** terminator was ESC, which is not emitted **/
 				term_char = ESC;
 				shbuf[i+1] = '\0';
 			}
@@ -933,7 +933,7 @@ static int cntlmode(Vi_t *vp)
 				cur_virt = 0;
 				vi_redraw((void*)vp);
 			}
-#endif /*SHOPT_EDPREDICT */
+#endif /* SHOPT_EDPREDICT */
 			break;
 
 
@@ -2265,7 +2265,7 @@ static int search(register Vi_t* vp,register int mode)
 		first_virt = 1;
 		getline(vp,SEARCH);
 		first_virt = 0;
-		virtual[last_virt + 1] = '\0';	/*** make null terminated ***/
+		virtual[last_virt + 1] = '\0';	/*** make null-terminated ***/
 		vp->direction = mode=='/' ? -1 : 1;
 	}