40035: Cosmetic fixes for comments and documentation.

Mostly fixes to doubled words.

Doc/Zsh/builtins.yo

@@ -570,7 +570,7 @@ with emulations to be set to their values in tt(sh).  tt(fno) then
 calls tt(fni); because tt(fni) is also marked for sticky tt(sh)
 emulation, no option changes take place on entry to or exit from it.
 Hence the option tt(cshnullglob), turned off by tt(sh) emulation, will
-be turned on within tt(fni) and remain on on return to tt(fno).  On exit
+be turned on within tt(fni) and remain on return to tt(fno).  On exit
 from tt(fno), the emulation mode and all options will be restored to the
 state they were in before entry to the temporary emulation.
 

Doc/Zsh/compsys.yo

@@ -144,8 +144,8 @@ directory mentioned in the tt(fpath) parameter, and should be autoloaded
 few utility functions, arrange for all the necessary shell functions to be
 autoloaded, and will then re-define all widgets that do completion to use the
 new system.  If you use the tt(menu-select) widget, which is part of the
-tt(zsh/complist) module, you should make sure that that module is loaded
-before the call to tt(compinit) so that that widget is also
+tt(zsh/complist) module, you should make sure that the module is loaded
+before the call to tt(compinit) so that the widget is also
 re-defined.  If completion styles (see below) are set up to perform
 expansion as well as completion by default, and the TAB key is bound to
 tt(expand-or-complete), tt(compinit) will rebind it to tt(complete-word);

Doc/Zsh/contrib.yo

@@ -3854,7 +3854,7 @@ The expression tt(<) followed (with no space) by a shell identifier
 causes the value of the variable with that name to be pushed
 onto the stack.  var(ident) may be an integer, in which
 case the previous result with that number (as shown before
-the tt(>) in th standard standard tt(zcalc) prompt) is put on the stack.
+the tt(>) in the standard tt(zcalc) prompt) is put on the stack.
 )
 item(Exchange: tt(xy))(
 The pseudo-function tt(xy) causes the most recent two elements of