Minor copyedits in Emacs manual in macos.texi

* doc/emacs/macos.texi (Mac / GNUstep Basics)
(Mac / GNUstep Events): Fix markup and capitalization.
(Bug#31568)

doc/emacs/macos.texi

@@ -59,7 +59,7 @@ default).  A value of @code{control}, @code{meta}, @code{alt},
 modifier keys; a value of @code{left} means be the same key as
 @code{ns-alternate-modifier}; a value of @code{none} tells Emacs to
 ignore them, in which case you get the default behavior of macOS
-accentuation system from the right option key.
+accentuation system from the right @key{Option} key.
 
   @kbd{S-mouse-1} adjusts the region to the click position,
 just like @kbd{mouse-3} (@code{mouse-save-then-kill}); it does not pop
@@ -170,7 +170,7 @@ the requested line (@code{ns-open-file-select-line}).
 This event occurs when a user drags an object from another application
 into an Emacs frame.  The default behavior is to open a file in the
 window under the mouse, or to insert text at point of the window under
-the mouse.  It may sometimes be necessary to use the @key{META} key in
+the mouse.  It may sometimes be necessary to use the @key{Meta} key in
 conjunction with dragging to force text insertion.
 
 @item ns-change-font