Fix doc and code inconsistency: now use =verbatim= and ~code~.

* org.el (org-emphasis-alist): Use `org-verbatim' for =text=
and `org-code' for ~text~.

* org.texi (Emphasis and monospace): Document the use of
=verbatim= and ~code~ to be consistent with
`org-element-text-markup-successor'.

Thanks to Yasushi for reporting this.

doc/org.texi

@@ -9738,8 +9738,8 @@ multiple footnotes side by side.
 @vindex org-fontify-emphasized-text
 @vindex org-emphasis-regexp-components
 @vindex org-emphasis-alist
-You can make words @b{*bold*}, @i{/italic/}, _underlined_, @code{=code=}
-and @code{~verbatim~}, and, if you must, @samp{+strike-through+}.  Text
+You can make words @b{*bold*}, @i{/italic/}, _underlined_, @code{=verbatim=}
+and @code{~code~}, and, if you must, @samp{+strike-through+}.  Text
 in the code and verbatim string is not processed for Org mode specific
 syntax, it is exported verbatim.
 

lisp/org.el

@@ -4120,8 +4120,8 @@ You need to reload Org or to restart Emacs after customizing this.")
   `(("*" bold)
     ("/" italic)
     ("_" underline)
-    ("=" org-code verbatim)
-    ("~" org-verbatim verbatim)
+    ("=" org-verbatim verbatim)
+    ("~" org-code verbatim)
     ("+" ,(if (featurep 'xemacs) 'org-table '(:strike-through t))))
   "Alist of characters and faces to emphasize text.
 Text starting and ending with a special character will be emphasized,