docs: manual: use correct terminology for menu functions

Author: progfolio

doc/elpaca.texi

@@ -591,7 +591,7 @@ With inheritance enabled:
 
 the elpaca-example-menu provides the rest of the ``burger'' recipe.
 
-The value may also be a menu-item symbol or list of menu-item symbols, in which case those menus are tried in order.
+The value may also be a menu symbol or list of menu symbols.
 This is a per-recipe way of setting @samp{elpaca-menu-functions}.
 
 @lisp
@@ -1100,4 +1100,4 @@ For example, the following search tag will embolden the first column of the @sam
 (cl-pushnew (cons 'bold-names #'+elpaca-bold-names) elpaca-ui-search-tags)
 @end lisp
 
-@bye
+@bye

doc/manual.md

@@ -468,7 +468,7 @@ With inheritance enabled:
 
 the elpaca-example-menu provides the rest of the “burger” recipe.
 
-The value may also be a menu-item symbol or list of menu-item symbols, in which case those menus are tried in order. This is a per-recipe way of setting `elpaca-menu-functions`.
+The value may also be a menu symbol or list of menu symbols. This is a per-recipe way of setting `elpaca-menu-functions`.
 
 ```emacs-lisp
 (elpaca-example (elpaca-recipe '(burger :inherit elpaca-example-menu)))
@@ -859,4 +859,4 @@ The pound (a.k.a. hash) character, `#`, followed by the name of a search tag fil
 
 <sup><a id="fn.4" class="footnum" href="#fnr.4">4</a></sup> [git ref](https://git-scm.com/book/en/v2/Git-Internals-Git-References)
 
-<sup><a id="fn.5" class="footnum" href="#fnr.5">5</a></sup> [remotes](https://git-scm.com/book/en/v2/Git-Basics-Working-with-Remotes)
+<sup><a id="fn.5" class="footnum" href="#fnr.5">5</a></sup> [remotes](https://git-scm.com/book/en/v2/Git-Basics-Working-with-Remotes)

doc/manual.org

@@ -329,7 +329,7 @@ With inheritance enabled:
 
 the elpaca-example-menu provides the rest of the "burger" recipe.
 
-The value may also be a menu-item symbol or list of menu-item symbols, in which case those menus are tried in order.
+The value may also be a menu symbol or list of menu symbols.
 This is a per-recipe way of setting =elpaca-menu-functions=.
 
 #+name: recipe-inheritance-menu