doc: further tweaks of mode-line section

doc/DOCUMENTATION.org

@@ -80,9 +80,9 @@
       - [[#anzu-integration][Anzu integration]]
       - [[#battery-status-integration][Battery status integration]]
       - [[#powerline-separators][Powerline separators]]
-      - [[#minor-modes][Minor Modes]]
     - [[#all-the-icons-theme][All-the-Icons theme]]
     - [[#custom-spaceline-theme][Custom spaceline theme]]
+    - [[#minor-modes][Minor Modes]]
   - [[#frame-title][Frame title]]
     - [[#iconified-tabified-title][Iconified (tabified) title]]
 - [[#layouts-and-workspaces][Layouts and workspaces]]
@@ -1274,9 +1274,7 @@ Currently supported themes are:
 The default theme is =spacemacs= and this theme is described in more detailed in
 the next section.
 
-=all-the-icons= is the theme defined in the package [[https://github.com/domtronn/spaceline-all-the-icons.el][spaceline-all-the-icons]]. If you
-want to use this theme you need to make sure to install the required fonts from
-the package repository, see [[https://github.com/domtronn/all-the-icons.el/tree/master/fonts][all-the-icons fonts directory]].
+=all-the-icons= is the theme defined in the package [[https://github.com/domtronn/spaceline-all-the-icons.el][spaceline-all-the-icons]].
 
 =custom= is a user custom spaceline theme, see the guide in the following section.
 
@@ -1396,7 +1394,37 @@ powerline, here is an exhaustive set of screenshots:
 | =zigzag=     | [[file:img/powerline-zigzag.png]]     |
 | =nil=        | [[file:img/powerline-nil.png]]        |
 
-**** Minor Modes
+*** All-the-Icons theme
+If you want to use this theme you need to make sure to install the required
+fonts from the package repository, see [[https://github.com/domtronn/all-the-icons.el/tree/master/fonts][all-the-icons fonts directory]].
+
+To change the separator type set the variable
+=spaceline-all-the-icons-separator-type=. All the powerline separators are
+supported (see table above).
+
+*** Custom spaceline theme
+You can create your own Spaceline theme by setting the variable
+=dotspacemacs-mode-line-theme= to =custom= and define a function called
+=spaceline-custom-theme= in your =dotspacemacs/user-init= function of your
+dotfile. This functions must accept a variadic number of arguments which are
+additional segments added by Spacemacs (like a segment to notify about available
+updates etc...).
+
+Example:
+
+#+BEGIN_SRC emacs-lisp
+(defun spaceline-custom-theme (&rest additional-segments)
+    "My custom spaceline theme."
+    (spaceline-compile
+      `(major-mode (minor-modes :when active) buffer-id)
+      `((line-column :separator " | " :priority 3)
+        ,@additional-segments))
+    (setq-default mode-line-format '("%e" (:eval (spaceline-ml-main)))))
+#+END_SRC
+
+Restart Emacs and enjoy your very own mode-line!
+
+*** Minor Modes
 Spacemacs uses [[https://www.emacswiki.org/emacs/DiminishedModes][diminish]] mode to reduce the size of minor mode indicators:
 
 The minor mode area can be toggled on and off with ~SPC t m m~
@@ -1447,28 +1475,6 @@ squared symbols like =🅿=.
 | ~SPC t C-W~ | =Ⓦ=     | W     | automatic whitespace cleanup globally                                |
 | ~SPC t y~   | =ⓨ=     | y     | [[https://github.com/capitaomorte/yasnippet][yasnippet]] mode                                                       |
 
-*** All-the-Icons theme
-*** Custom spaceline theme
-You can create your own Spaceline theme by setting the variable
-=dotspacemacs-mode-line-theme= to =custom= and define a function called
-=spaceline-custom-theme= in your =dotspacemacs/user-init= function of your
-dotfile. This functions must accept a variadic number of arguments which are
-additional segments added by Spacemacs (like a segment to notify about available
-updates etc...).
-
-Example:
-
-#+BEGIN_SRC emacs-lisp
-(defun spaceline-custom-theme (&rest additional-segments)
-    "My custom spaceline theme."
-    (spaceline-compile
-      `(major-mode (minor-modes :when active) buffer-id)
-      `((line-column :separator " | " :priority 3)
-        ,@additional-segments))
-    (setq-default mode-line-format '("%e" (:eval (spaceline-ml-main)))))
-#+END_SRC
-
-Restart Emacs and enjoy your very own mode-line!
 
 ** Frame title
 Default frame title displays name of current process and hostname of system. You